Question

Y+x=21
Calcule x e y

Answer 1

x / y = 4 / 10
( x + y ) /x = ( 4 + 10 ) / 4
21/ x = 14 / 4
14x = 21× 4
14x = 84
x = 84 / 14
x = 6

x + y = 21
6 + y = 21
y = 21- 6
y = 15