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Posted by on Thursday, February 7, 2013 at 7:46pm.

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.

k so i did this: x+ (x-.90) + (x+2.20) = 12.90

how do you solve for x though... i tried doing this but i just don't understand pleese help

  • Math 9 - , Thursday, February 7, 2013 at 7:57pm

    Let x = the parent's drink.

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

    Combine like terms:

    3x + 1.30 = 12.90

    3x = 12.90 - 1.30

    3x = 11.60

    x = 3.87

    3.87 + 2.97 + 6.07

  • Math 9 - , Thursday, February 7, 2013 at 7:59pm

    omg thank you, i was trying this too thanx:)

  • Math 9 - , Thursday, February 7, 2013 at 8:07pm

    You're very welcome.

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