A piece of red paper was used for drawing (3/8), and for writing slogans (4/8). How much of this paper was used up?
一张红纸绘画用去了(3/8)，写标语用去了(4/8)，一共用去了这张纸的几分之几？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/8) + (1/2)</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>