
Mark M. answered 12/05/14
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Mathematics Teacher - NCLB Highly Qualified
a = one angle
The other angle is 20 less (that means subtract) than twice (two times) the other - that is "a."
2a - 20 = the other angle.
Sum is the result of addition.
a + 2a - 20 = 133
3a - 20 = 133
3a = 153
a = 51
2a - 20 = 82
One angle is 51° and the other is 82°.