Math 9

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My family went to starbucks. We ordered 3 drinks. My daughter's drink was .90 cents less than my drink and my sons drink was $2.20 more than my drink. The total bill was $12.90. How much was each drink? Use algebra.

Please help me, thanx

  • Math 9 -

    lets call your drink cost x
    your sons y
    and daughters Z
    so x+y+z=12.9
    and y=x+2.2
    and z=x-0.9
    so x+x+2.2+x-0.9=12.9
    solve for x
    you get 3x=11.6
    x=3.867

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