For a manuscript, it takes 7 days for A to type alone, and 9 days for B to type alone. After 2 days of joint typing, A typed 68 pages more than B. How many pages does this manuscript have?
一件稿件，甲单独打字要7天完成，乙单独打字要9天完成，两人合打2天后甲比乙多打68页．这份稿件共有多少页？
<gadget id="calculator">4 / 63</gadget>
<output>4/63 = around 0.063492</output>

<gadget id="calculator">48 / (4/63)</gadget>
<output>756</output>

<result>756</result>