Umur Budi : Umur Dedi adalah 2 : 5

Jawaban:

Budi : dedi = 2 : 5

Dedi : dayu = 3 : 4

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selisih umur

Budi – dayu = 14

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berapa umur Budi?

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Budi = 2/5 dedi

Dayu = 4/3 Dedi

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Dedi = d

maka

Budi – Dayu = 14

2/5 d – 4/3 d = 14

(2×3)/(5×3) d – (4×5)/(3×5) d = 14

6/15 d – 20/15 d = 14

-14/15 d = 14

-14d = 14 x 15

-14d = 210

d = 210/14 = 15

maka umur Dedi = 15

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umur Budi = 2/5 Dedi = 2/5 x 15 = 2 x 3 = 6 tahun