If an angle is 20 degree more than its supplement,then find it.

Question

if an angle is 20 degree more than its supplement, then find it.

 

Answer 1

If the angle is x, then its supplement is 180 - x, right?

 

So we can say that x - 20 = 180 - x   because we would have to subtract 20 from x to equal its supplement.

 

So let's add x, and also add 20 to both sides, so we now get:

 

2x = 200, so x = 100 deg ANSWER    Easy to check:  x= 100, so its supplement = 180 - 100 = 80. And 100 is 20 more than 80. Ta da!!