Whakaoti mō X
X=400
Tohaina
Kua tāruatia ki te papatopenga
\frac{2}{5}X=140+20
Me tāpiri te 20 ki ngā taha e rua.
\frac{2}{5}X=160
Tāpirihia te 140 ki te 20, ka 160.
X=160\times \frac{5}{2}
Me whakarea ngā taha e rua ki te \frac{5}{2}, te tau utu o \frac{2}{5}.
X=\frac{160\times 5}{2}
Tuhia te 160\times \frac{5}{2} hei hautanga kotahi.
X=\frac{800}{2}
Whakareatia te 160 ki te 5, ka 800.
X=400
Whakawehea te 800 ki te 2, kia riro ko 400.
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