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y=druga część
x+y=240 000
½(x-y)=⅕x
x=240 000-y
½(240 000-y)-½y=⅕(240 000-y)
120 000-½y-½y=48 000-⅕y
-y+⅕y=48 000-120 000
-⅘y=-72 000
y=72 000:⅘
y=90 000
x=240 000-90 000
x=150 000
odp. kwote podzielono na kwoty:150 000 i 90 000.