Question

【題目】少先隊(duì)一、二、三中隊(duì)共植樹(shù)200棵,二中隊(duì)植樹(shù)的棵數(shù)是一中隊(duì)的2倍多5棵,三中隊(duì)植樹(shù)的棵數(shù)比一、二中隊(duì)之和多4棵,三個(gè)中隊(duì)各植樹(shù)多少棵？

Answer 1

【答案】一中隊(duì)31棵,二中隊(duì)67棵,三中隊(duì)102棵

【解析】

二中隊(duì)比一中隊(duì)的2倍多5棵,如果減去5就正好是一中隊(duì)的2倍,三中隊(duì)比一、二中隊(duì)的和多4棵,如減去4就是一、二中隊(duì)的和,因?yàn)槎�中�?duì)比一中隊(duì)的2倍多5棵,所以還要減去一個(gè)5才符合倍數(shù)關(guān)系。這樣,總數(shù)就變?yōu)?00-5-4-5=186(棵),相當(dāng)于一中隊(duì)的1+2+1+2=6(倍),這樣就可以求出一中隊(duì)植樹(shù)的棵數(shù),相應(yīng)也就可以求出二、三中隊(duì)植樹(shù)的棵樹(shù)了。

200-5-4-5=186(棵)

1+2+1+2=6

186÷6=31(棵)

31×2+5=67(棵)

31+67+4=102(棵)

答:一中隊(duì)植樹(shù)31棵,二中隊(duì)植樹(shù)67棵,三中隊(duì)植樹(shù)102棵。