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x - y = 2,5 => x = 2,5 +y
maka x + y = 20
2,5 + y + y = 20
2y = 20 - 2,5
2y = 17,5 => y = 8,75
x + 8,75 = 20
x = 20 - 8,75
x = 11, 25
perbandingan 11,25 : 8, 75 = 9 : 7 (dibagi 1,25) semoga membantu yaa