Răspuns:
1a. 7/100×500= 7×5=35
Explicație pas cu pas:
2b.
2/100×x=2
2x/100=20
2x=2000
x=1000
2.
3,5×2500000=87500000cm=87500km
3.
7k+5k+3k=240
15k=240|÷15
k=16
7×16=112
5×16=80
3×16=48
112+80+48=240
4..
3robinete....15ore
5robinete....X
regula de 3 simpla
x=(15×3)÷5=9ore
5.
Xsalar
15/100×X=225
15X/100=225
15X=22500|÷15
X=1500 lei
