SOLUTION: Someone please help.. Big tipper. On Monday Headley paid $1.70 for two cups of coffee and one doughnut, including the tip. On Tuesday he paid $1.65 for two doughnuts and a cup of

Question 1138229: Someone please help..
Big tipper. On Monday Headley paid $1.70 for two cups of coffee and one doughnut, including the tip. On Tuesday he paid $1.65 for two doughnuts and a cup of coffee, including the tip. On Wednesday he paid $1.30 for one coffee and one doughnut, including the tip. If he always tips the same amount, then what is the amount of each item?
I know how to do the math but I have no idea what the three equations would be... please help
Answer by ikleyn(52777) (Show Source): You can put this solution on YOUR website!
.

It is simple entertainment problem, designed and intended to be solved MENTALLY, without using equations.

1) compare Monday and Wednesday:


   Monday    :   2 coffee and 1 doughnut  PLUS tip    $1.70

   Wednesday :   1 coffee and 1 doughnut  PLUS tip    $1.30

  -----------------------------------------------------------  The difference is

                 1 coffee                              $0.40    ANSWER



2)  compare Tuesday and Wednesday:


    Tuesday   :   1 coffee and 2 doughnut  PLUS tip    $1.65

    Wednesday :   1 coffee and 1 doughnut  PLUS tip    $1.30

  -----------------------------------------------------------  The difference is

                               1 doughnut              $0.35    ANSWER

SOLVED.

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