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a+b=300
1/3(a-b)=1/4a /*12
a+b=300
4a-4b=3a
a+b=300
a-4b=0 /*(-1)
a+b=300
-a+4b=0
--------
3b=300
b=100
a=200
y - mniejsza liczba
x+y=3000
1/3(x-y)=1/4x |*12
x=3000-y
4x-4y=3x
x=3000-y
x=4y
4y=3000-y
5y=3000
y=600
x=3000-600
x=2400