Whakaoti mō Y
Y\geq 500
Tohaina
Kua tāruatia ki te papatopenga
20Y\geq 9600+400
Me tāpiri te 400 ki ngā taha e rua.
20Y\geq 10000
Tāpirihia te 9600 ki te 400, ka 10000.
Y\geq \frac{10000}{20}
Whakawehea ngā taha e rua ki te 20. I te mea he tōrunga te 20, kāore e huri te ahunga koreōrite.
Y\geq 500
Whakawehea te 10000 ki te 20, kia riro ko 500.
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