Question

Find two no whose sum is 21 and their difference will be 1.

Answer 1

Answer:

11 and 10

Explanation:

Let one of the numbers = x

Then the other number = (x-1)  

[The difference is 1]

We know that the sum of the two numbers is 21.

Then we can say:

x+ (x-1) = 21

x+x-1= 21

2x-1 = 21

2x = 22

x = 11

Then (x-1) = 10

Then the two numbers, x and (x-1) are 11 and 10.

Answer 2

Answer:

11 and 10 because 11+10=21 and 11-10=1