A & B are supplementary angles.
5a=4b
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Answer:
Supplementry angles sum upto 180
a+b=180
Multiply both sides with 5
5a+5b=900
Since 5a=4b
4b+5b=900
9b=900
B= 100
Since B= 100
5a=4(100)
5a=400
a= 400/5
A= 80
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