Simplification question for IBPS, SBI,Clerk, PO, RBI, clerk, Railways, SSC

[Q] Mohan has Rs. 720 in the denominations of 1-rupee coin, 2-rupee coin and 5-rupee coins. The number of coins of each denomination is equal. What is the total number of coins that he has ?
(a) 660
(b) 270
(c) 560
(d) 470

Solution

Answer    (b)
Explanation
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Let number of coins of each denomination be x.
Then x + 2x + 5x =720
8x =720
x = 90.
Hence, total number of notes = 3x = (3 x 90) = 270.