Question

How many numbers upto 700 are divisible by 3 and 5?

Answer 1

Hi User !!

Here's ur ans :-

We have to find the no. divisible by 15 so ,that the same no. would be divisible by 5 and 3.

AP form is :-

15 , 30 , 45 ................. 690

[ After 690 and upto 700 no any no. is divisible by 15 ]

First term ( a ) = 15

Common Difference ( d ) = 15

Last term ( an ) = 690


• an = a + ( n - 1 )d

690 = 15 + ( n - 1 ) × 15

690 = 15 + 15n - 15

690 = 15n

690/15 = n

46 = n

Total 46 nos. are upto 700 which are divisible by 15 i.e , 3 and 5 !!!