10.
x=nr pasari
rate=0,42x
curcani =9/28×0,42x=0,135x=54 x=54:0,135=400 pasari
rate=400×0,42=168 rate
gaini=400-54-168=178 gaini
11.L=41,3 cm
x=lungimea unui dreptunghi
x+3,7=lungimea celuilalt dreptunghi
x+3,7+x=41,3 cm
2x=41,3-3,7
2x=37,6
x=18,8 cm
x+3,7=18,8+3,7=22,5 cm
