Mom bought 15 kilograms of rice at 2.30 yuan per kilogram, and 15 kilograms of flour at 2.70 yuan per kilogram. How much did mother spend in total?
妈妈买了15千克大米，每千克2.30元，又买了15千克面粉，每千克2.70元，妈妈一共花了多少元？
<gadget id="calculator">2.3 * 15</gadget>
<output>34.5</output>

<gadget id="calculator">2.7 * 15</gadget>
<output>40.5</output>

<gadget id="calculator">34.5 + 40.5</gadget>
<output>75</output>

<result>75</result>