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

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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) About Me  (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  20%2F%281.00-0.75%29 = 20%2F0.25 = 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.