Question

A 3 digit number 4 A is added to another 984 to give a 4 digit number 13b7 which is exactly divisible by 11

Answer 1

this is an example problem pls solve ur problem by using these steps

984

-------

13b7

The first thing is to figure out the possible values of the sum. The missing digit can be 0 to 9:

1307, 1317, 1327, 1337, 1347, 1357, 1367, 1377, 1387, 1397

Only one of these is evenly divisible by 11, namely 1397, so b = 9.

Filling that in, we have:

. 4a3

+984

-------

1397

From that it is easy to figure the top number is 413 and thus a = 1.

a=1

b=9

a+b = 10

Answer:

10