Question

Write the value of a and b in the given odd number so that the number formed are divisible by 3 and 5: 7a25 or 8ab4b

Answer 1

we can directly do it by mind calculation .

add all the numbers if it is divisible by 3 then the number is divisible by three 7+a+2+5=14+a

so a=1,4,7

b;

b is 5 because it is odd number which is divisible by 5.

a=

8+a+5+4+5=22+a

a=2,5,8

so

these ARE the values of a and b