SOLUTION: There are 100 candy bars. Some cost 75 cents; some cost $1. The total cost was $80. How many $1 bars?

Question 999132: There are 100 candy bars. Some cost 75 cents; some cost $1. The total cost was $80. How
many $1 bars?
Answer by ikleyn(52787)   (Show Source): You can put this solution on YOUR website!
.
Answer. 80*$0.75 + 20*$1 = $60 + $20 = 80 dollars.

Solution

Let us assume for a minute that all the bars are priced $1 each.
Then the total cost would be $100, in $20 more than $80.
It is clear that the difference is due to presence of $0.75 bars that we intently counted as $1.
It is also clear that the number of these $0.75 bars is = = 80.

Thus it gives the answer.

For more problems that are solved using this approach see the lessons
    Problem on animals at a farm     and
    Problem on pills in containers
under the current topic Miscellaneous Word Problems of the section Word problems in this site.

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