Question

The number is four less than 2 times of other number. The difference is 21. What is the greatest number?

Answer 1

Let the other number is x.

The number is four less than 2 times of other number.

The number = 2x - 4

difference = 21

=> (2x-4) - x = 21

=> 2x - 4 - x = 21

=> x = 21 + 4

=>x = 25

So one of the number = 25

Another number = 2×25 - 4 = 46

greatest number = 46

Answer 2

Let the number be 'x'

four less than 2 times of number
→2x-4

Difference is 21
→(2x-4)-x=21
→2x-4-x=21
→x=21+4
→x=25

First number=25
Second=2×25-4→46