Question

the exterior angle of a triangle is 70 and the interior opposote angles are in the ratio 3:4 . find all the three angles of the triangle

Answer 1

let the opposite angles be 3x and 4x 
then
exterior angle = sum of opposite interior angles
implies 
70 = 3x + 4x
⇒7x = 70
⇒x=70÷7
⇒x=10
so opposite angles are
3x = 3×10 = 30
4x = 4×10 = 40

now
third angle = ?
we know that
the sum of all angles of a triangle are 180
⇒30 + 40 + third angle = 180
⇒70 + third angle = 180
⇒third angle = 180 - 70
                      = 110
so the three angles are 
first angle = 30
second angle = 40
third angle = 110
hope it helps 
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Answer 2

Hope it helps u.. Mark my answer as brainliest