Di ketahui perbandingan 3:7=x:49 serta x:49=y:147 berbalik nilai. nilai x + y=​

3/7 = x/49
x = 3 . 49/7
x = 3 . 7
x = 21

21/147 = y/49
y = 49 x 21/147
y = 1 x 21/3
y = 7

x + y
= 21 + 7
= 28