Xiao Wang's mother bought 12 kilograms of rice and 12 kilograms of noodles in the supermarket. It is known that rice costs 1.50 yuan per kilogram and noodles cost 1.80 yuan per kilogram. How much did Xiao Wang's mother spend on these rice noodles?
小王的妈妈在超市买回米、面各12千克，已知每千克米1.50元，每千克面1.80元．小王的妈妈买这些米面共花多少钱？
<gadget id="calculator">1.5 + 1.8</gadget>
<output>3.3</output>

<gadget id="calculator">3.3 * 12</gadget>
<output>39.6</output>

<result>39.6</result>