"Giant cucumbers" can grow up to 4 decimeters long, 15 centimeters longer than ordinary cucumbers. How many centimeters are ordinary cucumbers long?
"巨型黄瓜"可长到4分米长，比普通黄瓜长15厘米，普通黄瓜长多少厘米？
<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">40 - 15</gadget>
<output>25</output>

<result>25</result>