Xiao Ming reads a 750-page book. He reads (1/5) on the first day and 40% on the second day. How many pages should he read on the third day?
小明看一本750页的书，第一天看了(1/5)，第二天看了40%，第三天应该从第多少页看起．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">750 * (3/5)</gadget>
<output>450</output>

<gadget id="calculator">450 + 1</gadget>
<output>451</output>

<result>451</result>