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Step-by-step explanation:
Let angle b be x
Let angle a be 4x
Let angle c be 5x
Then,
4x+x+5x=180(sum of angle of a triangle is 180)
or,10x=180
or,x=180/10
x=18
angle a=4x=4*18=72
angle b=18
angle c=5x=5*18=90