There are 18 bottles of mineral water in each box, and each bottle costs 3 yuan. Dad bought 3 boxes of mineral water, how much did he spend?
每箱矿泉水有18瓶，每瓶3元，爸爸买了3箱矿泉水，花了多少元．
<gadget id="calculator">3 * 18 * 3</gadget>
<output>162</output>

<result>162</result>