Question

A teacher had t packs of notebooks, with 7 notebooks in each. He distributed 3 packs among his students. How many notebooks does he have left?

Answer 1

7t-21

Explanation:

In the beginning, the teacher has 7t notebooks. Since each pack if 7 notebooks, the teacher distributed 3*7=21 notebooks.

So, the teacher has 7t-21 notebooks left.

Hope this helps! :)