In a cinema hall 13 boys and 17 girls have occupied chairs. If the ratio of the number of chairs occupied to those unoccupied is 2:5, what is the total number of chairs in the hall?
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let no of occupied chairs = 2x
let no of unoccupied chairs = 5x
total no of occupied chairs = 13+17= 30
2x = 30 => x = 15
total no of unoccupied chairs = 5x = 5x15 = 75
total number of chairs in the hall = 75+30 = 105
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