If Jenny has 20 donuts and she gives away 10 how many does she have left?
2 answers:
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To solve this problem you must apply the proccedure shown below:
1. You must make a system of equation by using the information given in the problem above. Then, let's call:
: The number of computers sold.
: The number of hard drives sold.
2. Therefore, you have the following system of equations:
2. Solve for in the first equation and substitute it into the second equation:
3. Solve for :
4. Substitute the value of into the first equation to calculate
:
Therefore, the answer is: The store sold computers and
hard drives.