Question

Ajutati-ma la aceasta problema prin metoda comparatiei cu egalarea etc

Intr-o zi,15 fete si 10 baieti din grupul Micii ecologisti au plantat 420 panselute.A doua zi 12 fete si 10 baieti au plant 360 de panselute.Cate panselute a plantat un baiat si cate o fata pe zi?

Answer 1

15f..............10b.............420
12f..............10b..............360
———————————————
3f———————————60p
1f=60:3
1f=20
15f=15x20=300
10b=420-300=120
1b=120:10
1b=12

Answer 2

15 f......10 b......420 panselute
12 f..... 10 b.....360 panselute

15-12=3 fete
420-360=60 panselute
60:3=20 panselute a plantata o fata
20×15=300 panselute
420-300=120 panselute
120:10=12 panselute a plantat un baiat
V 15×20+10×12=300+120=420