Supplementary angles have a sum of 180 degrees.
If one angle is x, its supplementary angle is 180-x.
We are told that x is 8 less than triple its supplements so:
x=3(180-x)-8
x=540-3x-8
4x=532
x=133
You would have 30 coins, 6 dimes, 4 nickels, and 20 pennies.
Step-by-step explanation:

C
I-12-(-15)l
l-12+15l
l3l = 3