Question

兩個(gè)工程隊(duì)，甲隊(duì)人數(shù)比乙隊(duì)人數(shù)的少30人，若從乙隊(duì)調(diào)10人到甲隊(duì)，則甲隊(duì)人數(shù)是乙隊(duì)人數(shù)的，求兩隊(duì)各有多少人？

Answer 1

解：設(shè)甲隊(duì)有x人，乙隊(duì)有y人．
則
解得．
答：甲隊(duì)170人，乙隊(duì)250人．
分析：本題中有兩個(gè)等量關(guān)系：甲隊(duì)人數(shù)+30=×乙隊(duì)人數(shù)；甲隊(duì)人數(shù)+10=（乙隊(duì)-10）×，據(jù)此可列方程組求解．
點(diǎn)評(píng)：解題關(guān)鍵是弄清題意，找出合適的等量關(guān)系：甲隊(duì)人數(shù)+30=×乙隊(duì)人數(shù)；甲隊(duì)人數(shù)+10=（乙隊(duì)-10）×，列出方程組．