After spending 2/5 of an amount, the rest is increased by 25% and becomes 300. Find the amount.
400
Let the original amount be \(x\).
After spending \(\frac{2}{5}\) of it, the remaining amount is \(x - \frac{2}{5}x = \frac{3}{5}x\).
This remaining amount is increased by 25%, giving \(\frac{3}{5}x \times 1.25 = \frac{3}{4}x\).
This equals 300, so \(\frac{3}{4}x = 300\).
Solving gives \(x = 300 \times \frac{4}{3} = 400\).
Hence, the original amount is 400.
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