\frac{ \left( 5+5+ \left( 30-1 \right) d \right) 30 }{ 2 } =390
Whakaoti mō d
d=\frac{16}{29}\approx 0.551724138
Tohaina
Kua tāruatia ki te papatopenga
\left(5+5+\left(30-1\right)d\right)\times 30=390\times 2
Me whakarea ngā taha e rua ki te 2.
\left(10+\left(30-1\right)d\right)\times 30=390\times 2
Tāpirihia te 5 ki te 5, ka 10.
\left(10+29d\right)\times 30=390\times 2
Tangohia te 1 i te 30, ka 29.
300+870d=390\times 2
Whakamahia te āhuatanga tohatoha hei whakarea te 10+29d ki te 30.
300+870d=780
Whakareatia te 390 ki te 2, ka 780.
870d=780-300
Tangohia te 300 mai i ngā taha e rua.
870d=480
Tangohia te 300 i te 780, ka 480.
d=\frac{480}{870}
Whakawehea ngā taha e rua ki te 870.
d=\frac{16}{29}
Whakahekea te hautanga \frac{480}{870} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 30.
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