Aptitude - Number System Online Test, Number System Questions and Answers updated

Solution: The given series is -- 117, 144, 171, X , 225, 252 Consequtive numbers increases by 27 Following this pattern, the Missing Number X should increase by 27 from the previous number. When we add 27 to the number before X (i.e 171) we get 171+27=198

Solution: The fastest way to find the correct answer is by elimination rule : Check whether each of the given choices is divisble by both the numbers. If any choice doesn't get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers. Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.

Solution: Factors of 36 = 1, 2, 3, 4, 6, 9. Factors of 14 = 1, 2, and 7. Therefore, common factor of 36 and 14 = 1 and 2 Highest common factor (H.C.F) of 36 and 14 = 2. Therefore, 2 is H.C.F. or G.C.D. greatest common divisor of 36 and 14. H.C.F. or G.C.D. of given numbers is the greatest number which divides all the numbers without leaving a remainder.

Solution: The given series is -- 117, 90, 63, X , 9, -18 Consequtive numbers decreases by 27 Following this pattern, the Missing Number X should decrease by 27 from the previous number. When we subract 27 to the number before X (i.e 63) we get 63--27=36

Solution: The Least Common Multiple (L.C.M) of 3 and 41 can be computed by using the greatest common factor ie.,GCF of 3 and 41. This is the easiest approach: L.C.M(3,41) = (3 X 41) / GCF (3,41) = 123 / 1 = 123

Solution: The fastest way to find the correct answer is by elimination rule : Check whether each of the given choices divides both the numbers. If any of the given choices doesn't divide both the numbers, then you can eliminate that particular choice and move to the next choice. Answer will be the HIGHEST Number that exactly divides both given numbers

Solution: The given series is -- 117, 140, 163, X , 209, 232 Consequtive numbers increases by 23 Following this pattern, the Missing Number X should increase by 23 from the previous number. When we add 23 to the number before X (i.e 163) we get 163+23=186

Solution: The fastest way to find the correct answer is by elimination rule : Check whether each of the given choices is divisble by both the numbers. If any choice doesn't get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers. Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.

Solution: The given series is -- 117, 94, 71, X , 25, 2 Consequtive numbers decreases by 23 Following this pattern, the Missing Number X should decrease by 23 from the previous number. When we subract 23 to the number before X (i.e 71) we get 71--23=48

Solution: The fastest way to find the correct answer is by elimination rule : Check whether each of the given choices divides both the numbers. If any of the given choices doesn't divide both the numbers, then you can eliminate that particular choice and move to the next choice. Answer will be the HIGHEST Number that exactly divides both given numbers. Please Note : There may be a scenario when two or more numbers in the choice will exactly divide both the numbers, in that case , please choose the Highest among the numbers.

Solution: The given series is -- 117, 92, 67, X , 17, -8 Consequtive numbers decreases by 25 Following this pattern, the Missing Number X should decrease by 25 from the previous number. When we subract 25 to the number before X (i.e 67) we get 67--25=42

Solution: The fastest way to find the correct answer is by elimination rule : Check whether each of the given choices divides both the numbers. If any of the given choices doesn’t divide both the numbers, then you can eliminate that particular choice and move to the next choice. Answer will be the HIGHEST Number that exactly divides both given numbers. Please Note : There may be a scenario when two or more numbers in the choice will exactly divide both the numbers, in that case , please choose the Highest among the numbers.

Solution: The fastest way to find the correct answer is by elimination rule : Check whether each of the given choices is divisble by both the numbers. If any choice doesn’t get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers. Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.

Solution: The given series is -- 117, 142, 167, X , 217, 242 Consequtive numbers increases by 25 Following this pattern, the Missing Number X should increase by 25 from the previous number. When we add 25 to the number before X (i.e 167) we get 167+25=192

Solution: The fastest way to find the correct answer is by elimination rule : Check whether each of the given choices divides both the numbers. If any of the given choices doesn't divide both the numbers, then you can eliminate that particular choice and move to the next choice. Answer will be the HIGHEST Number that exactly divides both given numbers. Please Note : There may be a scenario when two or more numbers in the choice will exactly divide both the numbers, in that case , please choose the Highest among the numbers.

Solution: The fastest way to find the correct answer is by elimination rule : Check whether each of the given choices is divisble by both the numbers. If any choice doesn't get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers. Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.

Solution: The given series is -- 117, 96, 75, X , 33, 12 Consequtive numbers decreases by 21 Following this pattern, the Missing Number X should decrease by 21 from the previous number. When we subract 21 to the number before X (i.e 75) we get 75--21=54

Solution: The fastest way to find the correct answer is by elimination rule : Check whether each of the given choices divides both the numbers. If any of the given choices doesn't divide both the numbers, then you can eliminate that particular choice and move to the next choice. Answer will be the HIGHEST Number that exactly divides both given numbers. Please Note : There may be a scenario when two or more numbers in the choice will exactly divide both the numbers, in that case , please choose the Highest among the numbers.

Solution: The fastest way to find the correct answer is by elimination rule : Check whether each of the given choices is divisble by both the numbers. If any choice doesn't get divided by both the numbers, then you can eliminate that particular choice and move to the next number. Answer will be the Number that is exactly divisble by both given numbers. Please Note : There may be a scenario when two or more numbers in the choice will be exactly divisible by both the numbers, in that case , please choose the lowest among the numbers.

Solution: The given series is -- 117, 138, 159, X , 201, 222 Consequtive numbers increases by 21 Following this pattern, the Missing Number X should increase by 21 from the previous number. When we add 21 to the number before X (i.e 159) we get 159+21=180