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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

sorry I had to repost this question. i really need help

  • Math 9 -

    Let x = parent's drink, then daughter's = x -.90 and son's = x + 2.20.

    x + (x-.90) + (x+2.20) = 12.90

    Solve for x.

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