Question

4 carti costa cat 6 caiete,iar o carte si un caiet insumate dau 24 .
cat costa 5 carti si 7 caiete?

Answer 1

deci,fie x-costul cartilor,iar y-costul caietelor x+y=24 <=> x=24-y <=> 4x=6y 4(24-y)=6y x=24-y <=> x=24-y <=> 96-4y=6y 96=6y+4y x=24-y <=> x=24-y<=>x=24-9,6 96=10y y=96/10 y=9,6 <=> x=14,4 costa o carte y=9,6 costa un caiet 5×14,4=72 costa 5 carti 7×9,6=67,2 costa 7 caiete