Question

Problema 9 si 10 repede va rog!

Answer 1

Răspuns:

x=nr elevilor din clasa

x/4 - matematica

x-x/4=3x/4 - rest

3x/4·1/4=3x/16 - informatica

x/4+3x/16+18=x

4x+3x+288=16x

288=16x-7x

x=288:9

x=32 elevi

_______________

a+b=150=>a=150-b

10a+12b=1600

10(150-b)+12b=1600

1500-10b+12b=1600

2b=1600-1500

b=100:2=50 ladite de 12 kg

a=150-50=100 ladite de 10 kg