1) a+b=36 l
b=2a
a+2a=36
3a=36
a=12 l
b=2a
b=2×12=24 l
2) numarul pansleute albe=a
numarul pansleutelor mov=m
a=3m
a+m=72
3m+m=72
4m=72
m=72:4=18
a=3m=3×18=54
3) numarul mingilor de fotbal=f
numarul mingilor de volei=v
f+v=240
3v=f
3v+v=240
4v=240
v=240:4=60
3v=f
f=3×60=180
4) a+b=384
a=3b
3b+b=384
4b=384
b=384:4=96
a=3b=3×96=288
a-b=288-96=192
5) a+2a+3a=612
6a=612
a=612÷6
a=102