Question

Afla nr a, b, c, d, e, stiind ca:
a+b+c+d+e=80;â
a mai mic decat b cu 10
c=a+b
d mai mare decat a cu 6
e=2d

Answer 1

a+b+c+d+e=80
a=b-10
b=10+a
c=a+b
c=a+10+a
d=a+6
e=2×d
e=2×(a+6)
e=2×a+12

Înlocuim
a+b+c+d+e=80
a+10+a+a+10+a+a+6+2×a+12=80
7a=80-10-10-6-12
7a=42
a=42:7
a=6

b=10+a
b=10+6
b=16

c=a+b
c=6+16
c=22

d=a+6
d=6+6
d=12

e=2×d
e=2×12
e=24