Diketahui perbandingan 3:7= x:49 serta x:49 = y:147 berbalik nilai.Nilai x + y = ...

[tex] \frac{3}{7} = \frac{x}{9} [/tex]
[tex] \frac{x}{9} = \frac{y}{147} [/tex]
Maka x + y???

Jawaban :
[tex]\frac{3}{7} = \frac{x}{9} [/tex]
[tex]7x = 27 \\ x \: \: = \frac{27}{7} \\ x \: \: = 3 [/tex]
Dan :

[tex] \frac{x}{9} = \frac{y}{147} \\ \frac{3}{9} = \frac{y}{174} [/tex]
[tex]9y = 3 \times 147 \\ y \: \: = \frac{3 \times 147}{9} \\ y \: \: \: = 49[/tex]
Jadi nilai x + y = 3 + 49 = 52