Question

each of the two angles of an isosceles triangle is four times the third angle find the angle of the triangle

Answer 1

first angle =  4 x

second angle = first angle = 4 x

third angle = x

Angle sum property

a + b + c = 180

4 x + 4 x + x = 180

9 x = 180

x = 180/9

x = 20

4 x = 4 * 20 = 80

Answer 2

Let the third angle be x.Then other two angles be 4x and 4x. therefore x+4x+4x=180.
9x=180
x=20.
4x=80.