Math

A piece of rectangular plywood 42 cm by 35 cm is to be cut into smaller rectangular pieces each 10 cm by 7 cm. What is the maximum number of pieces it can be out into?

$\begin{array}{rcll} \frac{35}{7} \times [\frac{42}{10}] = 5 \times 4 = 20 \\\\ [\frac{35}{10}] \times \frac{42}{7} = 3 \times 6 = 18\\\\ [\dots] = \text{integer} \end{array}$

The maximum number is 20

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