For the composition competition, there are a number of first, second and third prizes, and those who win the first and second prizes account for 3/4 of the total, and those who win the second and third prizes account for 7/8 of the total. What percentage of the total.
作文竞赛，设一，二，三等奖若干名，获一，二等奖的占总数的(3/4)，获二、三等奖的占总数的(7/8)，获二等奖的占总数的几分之几．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">(7/8) - 1</gadget>
<output>-1/8 = around -0.125</output>

<gadget id="calculator">(3/4) + (-1/8)</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>