Soal SMP · Soal cerita · Kesulitan 3/5
A father is 4 times as old as his son. In 20 years, he will be twice as old as his son. How old is the son now?
- A.8
- B.10
- C.12
- D.15
Kunci jawaban & pembahasan
Jawaban: 8
Let son = x, father = 4x. In 20 years: 4x+20 = 2(x+20) → 4x+20=2x+40 → 2x=20 → x=10.
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