Math, asked by vaibhav375, 1 year ago

a positive number is 5 times of another number.if 21 is added to both numbers then one of the number becomes twice of the new number. what is the new number.plz solve it.

Answers

Answered by ziniyakhan
2
x = 5y

x + 21 = 2( y + 21 )

x + 21 = 2y + 42

Substitute the first equation in the second one ,

5y + 21 = 2y + 42

5y + 21 - 2y - 42 = 0

3y - 21 = 0

3y = 21

y = 21/3 = 7

x = 5y

Therefore , x = 5 × 7

x = 35

The number is 35 .
Similar questions