数学题：甲袋中的巧克力是乙袋中的五倍，如果从甲袋中拿走17块巧克力，并在乙袋中放入7块巧克力，这时甲、乙两袋巧克力块数相等，那么乙袋中原有多少块巧克力？（用方程解答。由“殇沬夕琳熏”同学提问）

数学题解答：

解：设乙袋中的巧克力是x块。
根据“这时甲、乙两袋巧克力块数相等”来列出方程。
5x-17=x+7
4x=24
x=6
答：乙袋中原有6块巧克力。

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