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2014-09-09T17:40:55+03:00
A)
 \frac{x}{4}= \frac{y}{5}  = \frac{z}{6} =k
x=4k
y=5k
z=6k
x+y+z=15
4k+5k+6k=15
15k=15
k=1
x=4
y=5
z=6
c)
 \frac{x}{5} = \frac{y}{7} =k
x=5k
y=7k
x+y=24
5k+7k=24
12k=24
k=2
x=10
y=14

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