1.

Muro marks in a Mathematics test. What is the ratio of hisMauternatics marks to his science marks?3An alloy consists of 15-g of zinc and 7g of copper. Find the ratio by weight of zinc to copper in thealloy.​

Answer»

ANSWER:

In △ABC AB=AC

⇒∠B=∠C (Angles opposite to equal sides are equal)

Now using ANGLE sum property

∠A+∠B+∠C=180

∘

⇒80

∘

+∠C+∠C=180

∘

⇒2∠C=180

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−80

∘

⇒∠C=

2

100

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=50

∘

now ∠C+∠x=180

∘

(Angles MADE on straight line (AC) are supplementary)

⇒50

∘

+∠x=180

∘

⇒∠x=180

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−50

∘

=130

∘


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