The age of two boys are in the ratio of 3:4, if the ratio of their ages was 2:3, before 4 years. find their present ages.
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Answer:
3x + 3
=
4
4x + 3 5
⇒ 16x + 12 = 15x + 15
⇒ 16x – 15x = 15 – 12
⇒ x = 3
∴ Required ratio after 21 years =
3x + 21
4x + 21
3 × 3 + 21
=
9 + 21
4 × 3 + 21 12 + 21
30
=
10
33 11
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