Mom bought 15 kilograms of apples and 15 kilograms of pears, 6 yuan per kilogram of apples, and 4 yuan per kilogram of pears. How much did you spend in total?
妈妈买回来苹果和梨各15千克，每千克苹果6元，每千克梨4元，共花去多少元？
<gadget id="calculator">6 * 15</gadget>
<output>90</output>

<gadget id="calculator">4 * 15</gadget>
<output>60</output>

<gadget id="calculator">90 + 60</gadget>
<output>150</output>

<result>150</result>