Question

determine o valor de x e  y

Answer 1

teorema de thales:

x+y=21

x/y=2/5
5x=2y
x=2y/5

x+y=21
2y/5+y=21
2y+5y=105
7y=105
y=105/7
y=15 #

x=2y/5
x=2.15/5
x=30/5
x=6 #