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Option 4 : x = 20, y = 28, z = 38
Let, after 10 years, the ages of P, Q and R be 15k, 17k and 24k, respectively.
So, the present age of P = 15k - 10
The present age of Q = 19k - 10
The present age of R = 24k - 10
According to question,
(15k - 10) + (19k - 10) - (24k - 10) = 10
⇒ 10k - 20 = 0
⇒ k = 2
⇒ The present age of P = 15k - 10 = 20 years
⇒ The present age of Q = 19k - 10 = 28 years
⇒ The present age of R = 24k - 10 = 38 years
According to question,
∴ x = 20, y = 28 and z = 38
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