A basketball is 60 yuan, and the price of a football is 20 yuan less than three times that of a basketball. How much is the price of a basketball cheaper than a football?
一个篮球60元，足球的价格比篮球的3倍少20元，篮球的价格比足球便宜多少元？
<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<gadget id="calculator">180 - 20</gadget>
<output>160</output>

<result>160</result>