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Question

Three angles together constitute a right angle i.e. 90. One of them is 30, second one is twice the third one. Find the third angle.


A

40

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B

60

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C

30

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D

20

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Solution

The correct option is D

20


Let, third angle be 'x', then second angle will be '2x'.

Sum of all the angles is given to be 90

i.e. x + 2x + 30 = 90

or 3x = 60

or x = 20

So the required angle is 20


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