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2014-04-17T15:09:30+03:00
A=3k
b=7k
c=8k

24k+49k+24k=485
97k=485
k=5

a=5*3
a=15

b=7*5
b=35

c=8*5
c=40

ax+b=c
15x+35=40
15x=40-35
15x=5
x=5/15
x=1/3
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2014-04-17T15:14:50+03:00
A)  a/3=b/7=c/8=k     a=3k  b=7k   c=8k
8a+7b+3c=485
24k+49k+24k=485       97k=485      k=5
a=15
b=35
c=40
b)    15x+35=40
    15x=5    x=1/3