Question

Stiind ca:
A) a+b+c=32
a=15-b
calculeaza-l pe c
B) Stiind ca:
a+b =100
b+c=110
a+c=90
Calculeaza:
A= , B= , C=

Answer 1

A) a+b+c=32
a=15-b => a+b=15
c=a+b+c-(a+b)=32-15=17
B) (a+b)+(b+c)+(a+c)=2(a+b+c)=100+110+90=300
=>a+b+c=300/2=150
a=(a+b+c)-(b+c)=150-110=40
b=a+b-a=100-40=60
c=a+c-a=90-40=50

Answer 2

a + b + c = 32
a = 15 - b
15 - b + b + c = 32
15 + c = 32
c = 32 -15
c = 17

2.
a + b = 100
b + c = 110
a + c = 90
2a + 2b + 2c = 100 + 110 + 90
2a + 2b + 2 c = 300 /:2
a + b + c = 150
100 + c = 150
c = 150 - 100
c = 50

b + c = 110
b + 50 = 110
b = 110 - 50
b = 60

a + c = 90
a + 50 = 90
a = 90 -50
a = 40
verificam
40 + 60 + 50 = 150