A temple donation box in Madurai holds only ten-rupee coins and five-rupee coins, 26 coins in all. There are 4 more ten-rupee coins than five-rupee coins. The priest lifts out one coin at random. What is the probability that it is a ten-rupee coin?

Question

Accepted Answer

15/26. Let the five-rupee coins be x. Then x + (x + 4) = 26 gives x = 11, so there are 11 five-rupee and 15 ten-rupee coins. P = 15/26. 11/26 answers for the five-rupee coins; 1/2 assumes the two kinds are equal in number; 15/22 subtracts the 4 from the total instead of splitting it correctly.

A temple donation box in Madurai holds only ten-rupee coins and five-rupee coins, 26 coins in all. There are 4 more ten-rupee coins than five-rupee coins. The priest lifts out one coin at random. What is the probability that it is a ten-rupee coin?

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