The school needs to buy 20 basketballs and 60 medicine balls, and the total cost is 1380 yuan. It is known that the unit price of basketballs is 31.5 yuan. What is the unit price of medicine balls?
学校要买20个篮球和60个实心球，共用去1380元，已知篮球单价为31.5元，实心球单价为多少？
<gadget id="calculator">31.5 * 20</gadget>
<output>630</output>

<gadget id="calculator">1_380 - 630</gadget>
<output>750</output>

<gadget id="calculator">750 / 60</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>