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2010-01-06T21:04:41+01:00
U=4v
5u-v=10

5 * 4v - v = 10
20v - v = 10
19v = 10
v = 10/19

u = 4 * 10/19
u = 40/19
u = 2 2/19

{3r=s
3r+s=24

3r + 3r = 24
6r = 24
r = 4

s = 3 * 4
s = 12
1 4 1