Răspuns :
a-b=40
a:b=5 => a=5b
5b-b=40
4b=40 =>b=40:4=10
a=5b =>a=5x10=50
10.
c=a+b
c-b=22
a+b-b=22 => a=22
b=22:2=11
c=22+11=33
9.
P-pâine
1P+0,5P=3
1,5P=3 => P=3/1,5=2lei
a:b=5 => a=5b
5b-b=40
4b=40 =>b=40:4=10
a=5b =>a=5x10=50
10.
c=a+b
c-b=22
a+b-b=22 => a=22
b=22:2=11
c=22+11=33
9.
P-pâine
1P+0,5P=3
1,5P=3 => P=3/1,5=2lei