Question

buna !ma poti ajuta??

Answer 1

5. 2a+3a=1000
5a=1000
a=200

6.a+b=80
2a-3b=35
2a= 35+3b
2(a+b)=2*80
2a+2b=160
35+3b+2b=160
5b=125
b=25
a=55

7. 100/100*x-20/100*x
80/100*x=64lei
4/5*x=64lei
4x=320lei
x=80lei
tricoul costa 80lei

Sper ca te-am ajutat!