Question

Daca x/5=9/y=21/35, atunci x+y este egal cu... Va rog urgent!!!

Answer 1

$\frac{x}{5} = \frac{9}{y} = \frac{21}{35} \\ \frac{x}{5} = \frac{21}{35} \\ 35*x=21*5|:5 \\ 7*x=21 |:7 \\ x=3 \\ \frac{9}{y} = \frac{21}{35} \\ 35*9=21*y|:7 \\ 5*9=3*y |:3\\ 5*3=y \\ y=15$