Question

A number is two times another number . If their sum is 105, what are the number

Answer 1

first number is 70

another number is 35

$x = 2y$

equation number 1

$x + y = 105$

$2y + y = 105$

from equation 1

$3y = 105$

$y = 105 \div 3$

$y = 35$

equation number 2

$x = 2y$

from equation 2

$x = 2(35)$

$x = 70$