数学题：甲、乙、丙三个组人数的比是2:3:5，甲、丙两组人比乙组人数多2倍还多2人，求各组人数?（由“劣徒”同学提出）

数学题解答（“保护色”同学解答）：用方程解答如，设每份人数是x人。根据“甲、丙两组人比乙组人数多2倍还多2人”来列方程。

2x + 5x – 2 = 3x × 2

7x – 2 = 6x

x = 2

甲组：2x= 2 × 2 = 4

乙组：3x= 3 × 2 = 6

丙组：5x= 5 × 2 = 10

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