If the order of operations of 15+60/5 is changed to add first and then divide, what should the formula be changed to?
如果把15+60/5的运算顺序改为先算加法，再算除法，那么算式应改为多少．
<gadget id="calculator">15 + 60</gadget>
<output>75</output>

<gadget id="calculator">75 / 5</gadget>
<output>15</output>

<result>15</result>