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To raise funds, a school sells two kinds of raffle tickets, Adults pay $6, children pay $1.50. Sales for both amounted to $900. If 375 tickets were sold, how many were childrens' tickets?

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let the number of children's tickets is x and adult's tickets is y

x + y = 375, x = 375 - y ........(1)

1.5x + 6y = 900............(2)

1.5(375-y) + 6y = 900

562.5 - 1.5y + 6y = 900

4.5y = 337.5

y = 75

x = 300

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