Question

How did ans come as x=7 pls explain with method

Answer 1

Answer:

Let positive number = 5x The other number = x

On adding 21 to both number: We get (5x+21) and (x+21)

According to the condition, we have

2 x (x+21) = 5x+21

2x + 42 = 5x +21

Transposing 42 to RHS, we have

2x = 5x + 21 - 42

Transposing 5x to LHS, we have

2x - 5x = -21

or

or

-3x = -21

Dividing both sides by (-3), we have

or

and

X = 7

5x = 5 x 7 = 35

Thus, the required numbers are 7 and 35.

Answer 2

Step-by-step explanation:

let the positive number be x

1. x=5x
2. x+21= 5x+21
3. 2(x+21)= 5x+21

open the brackets

2x+42 =5x+21

42-21 = 5x-2x

21 = 3x

21/3 =x

x=7