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If the outer angles at the three vertice...

If the outer angles at the three vertices of a triangle are. `(2 x+30)^(circ),(3 x-10)^(circ)` and `100^(circ)`, what is the value of `x ?`

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`2 x+30+3 x-10+100=360` `2 x+3 x=360-100+100-3 x=240` `therefore x=240/5=48`
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