1.

Take first angle = X

Second angle is twice as large as first = 2X

Third angle is 20 degrees lesser than first = X-20

We know that sum of all angles of a triangle is 180 degrees .

X+2X+(X-20) = 180

X+2X+X-20=180

4X-20=180

4X=180+20=200

4X=200

X=200/4=50

First angle =50degrees

Second angle =2×50=100 degrees

Third angle = 20-X =20-50=-30 = 30 degrees

Ignore negative sign

( If you get Value higher change formula so that negative answer does not come that is make the formula

X-20 ) .

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