Sam has 60 friends 1/3 live on the same street as Sam. of those who live on the same street 2/5 have the same number of brothers
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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: