MathRevolution wrote:
Lengthy Method:
Multiple of 36: 36, 72, 108, 144...
Q = 72 to 144 [9 multiples of 9: 72, 81, 90, 99, 108, 117, 126, 135, 144]
From 72 to 144 inclusive, multiples of 4 will be:
144 = 72 + (n-1) * 4
=> 72 = 4n - 4
=> n = 19
Answer B
Shortcut:
Between every two consecutive multiples of 36, there will be ten multiple of 4
72 = 36 + (n-1) * 4
=> 36 = 4n - 4
=> n = 10
Therefore, between two multiples of 36 (36 and 72) lies ten multiple of 4
So if there are 9 multiples of 9 in Q, the number of multiples of 4 would be = 9 + 10 = 19
Answer B
WHY 0 is not considered a multiple of 36 here? 0 is multiple of all numbers.
Statistics : Posted by mithunkrishna • on 18 May 2021, 05:30 • Replies 4 • Views 2679