Mom bought 30 kilograms of apples and 30 kilograms of pears from the supermarket, and the total cost was 99 yuan. 1.8 yuan per kilogram of apples, how much yuan per kilogram of pears? (solution by equation)
妈妈从超市买来苹果和梨各30千克，共用99元．每千克苹果1.8元，每千克梨用多少元？(用方程解)
<gadget id="calculator">1.8 * 30</gadget>
<output>54</output>

<gadget id="calculator">99 - 54</gadget>
<output>45</output>

<gadget id="calculator">45 / 30</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>