Discussion
A number exceeds its two-fifths part by 24. The number is:
Answer: A
Let the number be \(x\). Then \(x - \dfrac{2}{5}x = 24\), so \(\dfrac{3}{5}x = 24\) and \(x = 40\). Check: two-fifths of 40 is 16, and \(40 - 16 = 24\). The common slip is to solve \(\dfrac{2}{5}x = 24\), which gives 60 and does not satisfy the condition.
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