Whakaoti i te (1-85%)*2N=84

$$( 1 - 85 \% ) \times 2 N = 84$$

Whakaoti mō N

$$N=280$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakahekea te hautanga \frac{85}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 5.

$$\left(1-\frac{17}{20}\right)\times 2N=84$$

Me tahuri te 1 ki te hautau \frac{20}{20}.

$$\left(\frac{20}{20}-\frac{17}{20}\right)\times 2N=84$$

Tā te mea he rite te tauraro o \frac{20}{20} me \frac{17}{20}, me tango rāua mā te tango i ō raua taurunga.

$$\frac{20-17}{20}\times 2N=84$$

Tangohia te 17 i te 20, ka 3.

$$\frac{3}{20}\times 2N=84$$

Tuhia te \frac{3}{20}\times 2 hei hautanga kotahi.

$$\frac{3\times 2}{20}N=84$$

Whakareatia te 3 ki te 2, ka 6.

$$\frac{6}{20}N=84$$

Whakahekea te hautanga \frac{6}{20} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$\frac{3}{10}N=84$$

Me whakarea ngā taha e rua ki te \frac{10}{3}, te tau utu o \frac{3}{10}.

$$N=84\times \frac{10}{3}$$

Tuhia te 84\times \frac{10}{3} hei hautanga kotahi.

$$N=\frac{84\times 10}{3}$$

Whakareatia te 84 ki te 10, ka 840.

$$N=\frac{840}{3}$$

Whakawehea te 840 ki te 3, kia riro ko 280.

$$N=280$$