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2014-11-18T11:25:16+02:00
A + B  = 15
    2

B     4
A + B = 30
B = 4A
A + 4A = 30
5A = 30
A = 30 : 5
A = 6
B = 4 * 6
B = 24
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2014-11-18T11:26:08+02:00
A/b=1/4⇒b=4a
(a+b):2=15
a+b=15x2
a+b=30
a+4a=30
5a=30
a=30:5
a=6    b=4a=4x6=24  b=24
1 5 1