During a promotion a music store gives a free CD to every 15th customer and free DVD to every 40th customer. Which customer will
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For this case we have a quadratic equation, , of the form
Where:
We can solve the equation by factoring, that is, we bias two numbers that multiplied give as a result -60 and added as a result 28.
These numbers are:
Then, the factorization is given by:
The roots are:
Answer: