## 192. Math Puzzle $5 / 81$

The students of class 7 b collected a total of $336 \mathrm{~kg}$ of waste paper. From $1 \mathrm{~kg}$ of waste paper, a paper factory produces $700 \mathrm{~g}$ of pure white paper, and from every $30 \mathrm{~g}$ of this, a writing pad is made.

What is the maximum number of pads that can be made from the collected waste paper?
From $336 \mathrm{~kg}$ of waste paper, $235.2 \mathrm{~kg}$ of pure white paper can be produced, because $336 \mathrm{~kg} \times 0.7 \mathrm{~kg}=235.2 \mathrm{~kg}$.

With a consumption of $30 \mathrm{~g}$ of paper per notebook, $7840$ notebooks can be produced from $235.2 \mathrm{~kg}$: $235200 \mathrm{~g} \div 30 \mathrm{~g}=7840$.

Class 7b therefore collected waste paper that was sufficient for the production of 7840 notebooks.