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bus tickets cost $3 for an adult and $2 for a child. there are 'a' adults nd 'c' children on a bus. the total number of people on the bus is 52. the total cost of the 52 tickets is $139. find the number of children on the bus.

  • maths -

    number of kids --- x
    number of adults -- 52-x

    solve for x .....

    2x + 3(52-x) = 139

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