There are 3 baskets of apples and 5 baskets of duck pears in the fruit shop, totaling 135 kilograms. Each basket of duck pears weighs 18 kilograms. How many kilograms of apples are in each basket?
水果店有3筐苹果和5筐鸭梨共135千克，每筐鸭梨18千克，每筐苹果多少千克？
<gadget id="calculator">18 * 5</gadget>
<output>90</output>

<gadget id="calculator">135 - 90</gadget>
<output>45</output>

<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<result>15</result>