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maths urgent

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The average mass of half the number of crabs in a basket is 350g, the average mass of the remaining crabs is 300g. If the total mass iof the crabs in the basket is 13kg, how many crabs are there in the basket?

  • maths urgent -

    350+300=650g
    13kg=13000g
    13000/650
    =20crabs

  • maths urgent -

    let number of crabs be x
    mass of 1/2 the craps
    = 350(x/2) =175x
    mass of remaining ones = 300(x/2) = 150x


    175x + 150 = 13000
    325x = 13000
    x = 40

    there were 40 crabs

    check:
    half of 40 = 20
    so 20(350) + 20(300) = 13000

    oi's answer makes no sense and does not check out.

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