<PRE><B>Question 991870</B>
the sum of the angle of a triangle is 180 degrees.
the angles are x and y.
there are two angles of x degrees and one angle of y.
you get 2x + y = 180
you are given that x = 4y
this means that y = x/4
2x + y = 180 becomes 2x + x/4 = 180
multiply both sides of that equation by 4 to get:
8x + x = 4 * 180
combine like terms to get:
9x = 4 * 180
divide both sides of that equation by 9 to get:
x = 4 * 180 / 9
simplify to get x = 80.
since x is equal to 4 * y, then y = 20.
your 3 angles are 80, 80, 20
they add up to 180.
80 is 4 times 20.
problem is solved.

</PRE>