Question

ex 22 și 23 găsit rogg

Answer 1

22)

r = rosi

c= castraveti

4r+5c=8,8

5r+4c=9.2

9r+9c= 18

9(r+c)= 18

r+c= 2

r= 2-c

4(2-c)+5c=8,8

8-4c+5c= 8,8

c= 8,8-8

c=0.8 lei

r=2-0.8

r= 1.2 lei

23)

x+y= 140 lei

=> x= 140 -y

majorare:

x+ x*10/100 = x+ x/10 = 11x/10

y+y*15/100 = y+ 3/20 = 23y/20

11x/10 + 23y/20 = 158

11*(140-y)/10 +23y/20 = 158

1540-11y/10 +23y/20 = 158

3080-22y+23y= 3160

y= 3160-3080

y= 80 lei

x=140 -80 = 60 lei