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Who can heip me!

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Who can heip me!
1.一个角的余角比它的补角的1/3少20度,求这个角．
设这个角是x
．．．
Who can heip me!
设这个角是x
余角＝90-x
补角＝180-x
一个角的余角比它的补角的1/3少20度
所以1/3（180-X）－20＝90-x
60-x/3-20＝90-x
2x/3＝90-40
x＝75°
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