Question

A three digit number 35a is added with another
three digit number 728 to give a four digit number
as 10b5. Find the value of b + a.​

Answer 1

Answer:

Step-by-step explanation:

According to the question

4a3+984=13b7

a+8=b

Thenb−a=8

According to the question  13b7 is divisible by 11

(7+3)−(b+1)=(9−b)

(9−b)=0

b=9

b=9anda=1

Then a+b=9+1=10

Answer 2

Answer:

15

Step-by-step explanation:

Looking at the addition in unit place , we have:

a + 8 = 5

We know this is possible only when a = 7. [Since 8 + 7 = 15, which makes 5 to remain in unit place and 1 will be carried over to tens place].

Looking at the addition in tens place , we have:

5 + 2 = b

If you remember, from our last step, we have an extra +1 carried over here. So the real expression becomes :

5 + 2 + 1 = b

=> b = 8

Hence, a = 7 and b = 8

So, b + a = 8 + 7 = 15