Xiaohua plans to complete some oral arithmetic problems a week, and he has completed (2/5) now, and can complete all (2/3) by doing 40 more questions. How many oral arithmetic problems does Xiaohua complete in a week?
小华计划一周完成一些口算题，现在已经完成了(2/5)，再做40题就可以完成全部的(2/3)，小华一周要完成多少口算题？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">40 / (4/15)</gadget>
<output>150</output>

<result>150</result>