Question

math olympied 8th standard

Answer 1

Digit at unit place is b
so digit at tens place is (3+b)

Now if we have a 2 digit number say 17, it can be expanded as 1×10 + 7×1

So the number we are going to find can be written as
(3+b)×10 + b×1
=30+10b+b
=30+11b

Hope it helps..... :-)