Question 1195141
.
Javonne purchased some art supplies and paid for them with a $20 bill. 
The cashier handed her c dollars in change, which was a mistake. 
To fix the mistake, Javonne returned $1.00 to the cashier. 
lf she purchase price was twice the amount of change
that Javonne was originally given, what is the value of c?
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<pre>
From the condition, the price of the purchase was 20-c+1 dollars.


It is given that this price is twice as the amount of "c",

so we write an equation

    20 - c + 1 = 2c.


It can be solved in couple of lines

    20 + 1 = 2c + c

       21  =   3c

        c  =   21/3 = 7.


<U>ANSWER</U>.  The value of  "c"  is  7  dollars.
</pre>

Solved.


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This problem is good (and such problems are good), &nbsp;when  a teacher wants to train a young pupils 
to setup and to solve non-standard problems.


At such circumstances, &nbsp;than simpler a solution approach is, than it is better.


It is why I came with this solution.



With it, &nbsp;using one single equation for setup, &nbsp;the solution can be explained 
to a 5-th grade student, &nbsp;who just started to learn problems with one equation,
but did not learn systems of equations, &nbsp;yet.