1,500 sheets of paper are used for binding 30 exercise books. If the same 50 exercise books are bound again, how many sheets of paper are needed in total?
装订组装订30本练习本用纸1500张，如果再装订同样的50本练习本，一共需要纸多少张？
<gadget id="calculator">1_500 / 30</gadget>
<output>50</output>

<gadget id="calculator">30 + 50</gadget>
<output>80</output>

<gadget id="calculator">50 * 80</gadget>
<output>4_000</output>

<result>4_000</result>