27 right hand students, 3 left hand students
Work Step by Step
x = right hand students y = left hand students $x=9y$ and $x+y=30$ $x+y = 30$ $9y+y = 30$ $10y = 30$ $10y/10 = 30/10$ $y= 3$ $x=9y$ $x = 9*3$ $x = 27$
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