During the Spring Festival, Xiaohong and Wang Qiang from the calligraphy team were going to write some Spring Festival couplets with big "Fu" characters for free. When Xiaohong finished writing 40%, Teacher Li said to Wang Qiang: "If you write 105 "Fu" characters If so, it will exceed (1/10) of the task." Smart, can you figure out how many big "Fu" characters the two of them have to write together? ．
春节期间，书法小队的小红和王强准备写一些大‘福’字春联免费赠送给各家，当小红写完40%时，李老师对王强说："如果你写105张‘福’字的话，就超出任务的(1/10)"聪明的你能算出他们两人共要写多少张大‘福’字？．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(3/5) + (1/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">105 / (7/10)</gadget>
<output>150</output>

<result>150</result>