Question

find a and b so that the following odd number are divisible by both 3 and 5 (I) 7b25 and (ii) 8ab4b... please answer steps by step​

Answer 1

Answer:

(i)7b25

It is divisible by 5.

For it to be divisible by 3, 5+b must be divisible by 3.

Therefore, b=1,4,7

(ii)8ab4b

For the number to be odd and divisible by 5, b=5

Now, for it to be divisible by 3, 4+a must be divisible by 3.

Therefore, a=2,5,8

Answer 2

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