Ninety coins are to be distributed among \( P, Q \) and \( R \) such that \( P \) gets twice as ...

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Ninety coins are to be distributed among \( P, Q \) and \( R \) such that \( P \) gets twice as many coins as \( Q \) gets and \( Q \) gets thrice as many coins as \( R \) gets.
Find the number of coins \( \mathrm{R} \) gets.
(a) 6
(b) 3
(c) 10
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