Discussion
A total of 324 coins of 20 paise and 25 paise make a sum of Rs. 71. The number of 25-paise coins is
Answer: D
The number of 25-paise coins is 124, so the answer is None of these.
Let \(x\) be the 20-paise coins and \(y\) the 25-paise coins. In paise:
\[ \begin{aligned} x + y &= 324 \\ 20x + 25y &= 7100 \\ 20 \times 324 + 5y &= 7100 \\ 5y &= 620, \quad y = 124 \end{aligned} \]
Check: 200 coins of 20 paise make Rs. 40 and 124 of 25 paise make Rs. 31, Rs. 71 in all. 120, 200 and 144 do not satisfy both conditions (200 is the number of 20-paise coins).
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