There are 56 pebbles in Chengcheng, and 4 more pebbles are 4 times that of Feifei. How many more pebbles are there in Chengcheng than Feifei?
城城有56颗鹅卵石，再多4颗就是菲菲的4倍，城城比菲菲多多少颗．
<gadget id="calculator">56 + 4</gadget>
<output>60</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">56 - 15</gadget>
<output>41</output>

<result>41</result>