Tīpoka ki ngā ihirangi matua
Whakaoti mō x
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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

5+7+10+x=287
Tāpirihia te 1 ki te 4, ka 5.
12+10+x=287
Tāpirihia te 5 ki te 7, ka 12.
22+x=287
Tāpirihia te 12 ki te 10, ka 22.
x=287-22
Tangohia te 22 mai i ngā taha e rua.
x=265
Tangohia te 22 i te 287, ka 265.