# Textbooks

After check of textbooks found that every 10-th textbook should be withdrawn. Together 58 textbooks were withdrawn.

How many textbooks were in stock before withdrawn and how many after withdrawn?

Result

before:  580
after:  522

#### Solution:

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#### To solve this example are needed these knowledge from mathematics:

Do you have a linear equation or system of equations and looking for its solution? Or do you have quadratic equation?

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