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After check of textbooks found that every 10-th textbook should be withdrawn. Together 58 textbooks were withdrawn.

How many textbooks were in stock before withdrawn and how many after withdrawn?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

$n_1 / 10 = 58 \ \\ n_1 = 10 \cdot 58 = 580$
$n_2 = n_1 - 58 = 522$

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