If a house is paved with square bricks with a side length of 4 decimeters, 90 pieces are needed. If the square bricks with a side length of 6 decimeters are used instead, how many pieces are needed?
一间房子铺地砖，用边长是4分米的方砖，需要90块，如果改用边长是6分米的方砖，需要多少块？
<gadget id="calculator">4 * 4 * 90</gadget>
<output>1_440</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">1_440 / 36</gadget>
<output>40</output>

<result>40</result>