Question

pls repede

Din 20 m de stofa se confectioneaza 8 costume identice. Din 42,5 m de stofa se pot face ........... costume de acelasi fel.

Answer 1

17 costume

20m=8 costume
20:8=2,5
2,5 m =1 costum
20+20+2,5=17 costume
8+8+1=17 :D

Answer 2

e regula de trei simpla
20 m stofa................8 costume
42,5 m stofa...................x
x=42,5*8/20=340/20=17 costume