Question

Va rog sa ma ajutați
Dau coroana

Answer 1

5. a=albe
r=rosii
b=albastre

a+r+b=140
b x 4 = a
b x 2 = r

b x 4 + b x 2 + b = 140

7b=140
b=140:7
b=20

a=20x4=80
r=20x2=40

20+80+40=140

6. a+b=77
b:a=4+12
b=ax4+12

Inlocuim:

a + a x 4 + 12 = 77
5a + 12 = 77
5a = 77-12=65
a=65:5
a=13

b=77-13
b=64

13+64=77

7. x+y=480
x = y:5
y=x • 5
x + x • 5 = 480
6x = 480
x=480:6
x=80

y=480-80
y=400

400+80=480