Mom bought 6 towels for 30 yuan. If mom bought 9 of the same towels, how much would it cost?
妈妈买6条毛巾用了30元，如果妈妈买9条同样的毛巾，需要多少钱？
<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<result>45</result>