Find how many donuts each student will receive if you share 126 donuts in a ratio of 1:5:8

Correct result:

a =  9
b =  45
c =  72


x=1261+5+8=9 a=1 x=1 9=9x=\dfrac{ 126 }{ 1+5+8 }=9 \ \\ a=1 \cdot \ x=1 \cdot \ 9=9
b=5 x=5 9=45b=5 \cdot \ x=5 \cdot \ 9=45
c=8 x=8 9=72c=8 \cdot \ x=8 \cdot \ 9=72

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