Some apples and pears, apples account for 4 less of the total (5/9), and 6 more pears account for the total (2/5), how much less apples than pears?
一些苹果和梨，苹果占总数的(5/9)少4个，梨占总数的(2/5)多6个，苹果比梨少多少？
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

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

<gadget id="calculator">1 - (5/9) - (2/5)</gadget>
<output>2/45 = around 0.044444</output>

<gadget id="calculator">2 / (2/45)</gadget>
<output>45</output>

<gadget id="calculator">45 * (5/9)</gadget>
<output>25</output>

<gadget id="calculator">25 - 4</gadget>
<output>21</output>

<gadget id="calculator">45 - 21 - 21</gadget>
<output>3</output>

<result>3</result>