There are 150 table tennis balls in the school, which is 5 times less than footballs. How many footballs are there?
学校有乒乓球150只，比足球的5倍少5只，足球有多少只？
<gadget id="calculator">150 + 5</gadget>
<output>155</output>

<gadget id="calculator">155 / 5</gadget>
<output>31</output>

<result>31</result>