Răspuns :
a, b, c, d
a=2b
b=4c=> c=b/4
d=2e
d=10c => =c=d/10
d+e=75
2e+e=3e=75
=> e=25
d=50
c=50/10=5
b=4c=4*5=20
a=2b=40
a=2b
b=4c=> c=b/4
d=2e
d=10c => =c=d/10
d+e=75
2e+e=3e=75
=> e=25
d=50
c=50/10=5
b=4c=4*5=20
a=2b=40