It costs 75 yuan to buy apples and pears, of which the money spent on buying apples is 4 times that of pears, 4 yuan per kilogram of apples, and 3 yuan per kilogram of pears. How many kilograms of apples and pears did you buy?
买苹果和梨共用去75元，其中买苹果用去的钱是买梨的4倍，苹果每千克4元，梨每千克3元，苹果和梨工买了多少千克．
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">75 / 5</gadget>
<output>15</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">75 - 15</gadget>
<output>60</output>

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

<gadget id="calculator">5 + 15</gadget>
<output>20</output>

<result>20</result>