The ratio of books in classes A and B is 7:4. Class A has 60 more books than Class B, how many books does Class A have?
甲、乙两个班图书本数比是7：4．甲班比乙班多60本，甲班有图书多少．
<gadget id="calculator">7 - 4</gadget>
<output>3</output>

<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">20 * 7</gadget>
<output>140</output>

<result>140</result>