Răspuns:
ex 6
40l......15 kg
100l.....x kg
(100×15)/40=1500/40=37,5 kg
ex 7
6÷4=1,5 adica nr de persoane a scazut de 1,5 ori
8×1,5=12 ore
ex 8
40 pagini.....60 s
8 pagini.......x s
(8×60)/40=480/40=12 secunde
ex 9
x-20/100=96
x-1/5=96
x/5=96
x=5×96=480 lei
