# Textbooks

After check of textbooks found that every 8-th textbook should be withdrawn. Together 74 textbooks were withdrawn.

How many textbooks were in stock before withdrawn and how many after withdrawn?

Result

before:  592
after:  518

#### Solution:

$$\smash{ n_1 / 8 = 74 \\~\\n_1 = 8 \cdot 74 = 592 \\~\\n_2 = n_1 - 74 = 518 }$$

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