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20x = 80
x = 4
b) 8 : 5 = (x + 5) : 15
120 = 5(x + 5)
120 = 5x + 25
5x = 95
x = 19
⇒x/5 =16/20
⇒20x =80
⇒x =4
b.nilai y
⇒8/5 =(y+5)/15
⇒5y+25 = 120
⇒5y = 120 -25
⇒5y = 95
⇒y = 19