When calculating 20-□*(3/4), if you calculate the subtraction first and then the multiplication, how much is the result of the calculation different from the correct answer?
在计算20-□*(3/4)，如果先算减法，再算乘法，这样计算的结果与正确答案相差多少？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">20 * (3/4)</gadget>
<output>15</output>

<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<result>5</result>