Question

please answer this question

Answer 1

Then, a+b equal to the 9

Answer 2

since,4a3+984=13b7

a can be 0 or 1 (because if a is 2 or greater than 2 ,then the sum would be 14b3 as 8+2 is 10 and 1 would be carried over)

if a=0

403+984=1384

But,1384 is not a multiple of 11

if a=1

413+984=1397

1397 is 127x11 so it is divisible by 11

so we can conclude that a=1 and b=9

a+b=10