Question

Repede...15...si 16....urgent...

Answer 1

Răspuns:

Explicație pas cu pas:

F + B = 25

B = F*2/3

F + F*2/3 = 25

F*5/3 = 25

F = 25*3/5 = 15 fete

B = 25 - 15 = 10 baieti

________

C + I = 9

5C - 3I = 29

I = 9 - C

5C - 3(9 - C) = 29

5C - 27 + 3C = 29

8C = 29 + 27 = 56

C = 56 : 8 = 7 raspunsuri corecte

Answer 2

Salut,

ex 15:

f=fete

b=baieti

f+b=25

b=2f:3

2f:3+f=25

5f=25×3

f=75:5

f=15

b=2×15÷3

b=10

ex 16:

5x-3y=29

x+y=9/3

5x-3y=29

3x-3y=27

8x=56

x=7(rasp corecte)

y=2(rasp gresite)