Question

In each of the following numbers, replace * by the smallest number to make it divisible by 3.
1) 75*5 2) 35*64
3) 18*71

Answer 1

Answer:

A no. is divisible by 3 if total of its digits is divisible by 3

1) 75*52

total of digits = 7+5+*+5+2 = 19+*

so 19+* will be divisible by 3 if *=2,5,8

but here we take * = 2 as que. says smallest no.

2) 35*64= 3+5+*+6+4 = 18 +*

so * = 0 as 18 is divisible by 3

3) 18*71= 1+8+*+7+1= 17+ *

so *= 1