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March 28, 2017

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The number of Samad's stamps is 30% of Derrick's stamps. The number of Derrick's stamps is 40% of Bee Hua's stamps. If they have 608 stamps, how many stamps does Derrick have?

  • maths - ,

    S=.3D
    D=.4B
    B+D+S=608

  • maths - ,

    sorry i can't get it, pls explain further. tks

  • maths - ,

    first equation, combine that with the second and third equation.

    S=.3D
    S=.3*.4D
    Put that into the last equation.

    1) B+D+.12D=608
    now, solve for B in the second equation
    B=D/.4=2.5D Now put that in your equation 1) above, solve for D

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