Question

calculează a+b+c știind că : 60 + ( a-21 ) = ( 77-b) +85 = 100 = 55 + ( 70 - c)

Answer 1

55+(70-c)=100
70-c=100-55
70-c=45
c=70-45
c=25

(77-b)+85=100
77-b=100-85
77-b=15
b=77-15
b=62

60+(a-21) =100
a-21=100-60
a-21=40
a=40+21
a=61

a+b+c=61+62+25=148