A pan can only bake 2 cakes at a time, both sides need to be baked, each side needs 3 minutes, how many minutes should it take to bake 59 cakes at least.
一个平底锅每次只能烙2张饼，两面都要烙，每面需要3分钟，烙熟59张饼至少需要多少分钟．
<gadget id="calculator">56 / 2</gadget>
<output>28</output>

<gadget id="calculator">3 * 2 * 28</gadget>
<output>168</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">168 + 9</gadget>
<output>177</output>

<result>177</result>