To decorate the living room of Lily’s house, it costs 100 yuan to use square bricks with a side length of 4 decimeters to pave the floor; now it uses square bricks with a side length of 5 decimeters, how many pieces are needed? (Solve with ratio)
莉莉家装修客厅，用边长是4分米的方砖铺地，需要100块；现在改用边长是5分米的方砖，需要多少块？(用比例解)
<gadget id="calculator">4 * 4 * 100</gadget>
<output>1_600</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">1_600 / 25</gadget>
<output>64</output>

<result>64</result>