There are 12 yellow balls and several red balls in a pocket, they are identical except for the color, the probability of drawing a red ball from it is (3/4). How many red balls are in this pocket?
一个口袋中有12个黄球和若干个红球，它们除颜色外完全相同，从中任意摸出一个红球的可能性是(3/4)．这个口袋中有红球多少个？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12 / (1/4)</gadget>
<output>48</output>

<gadget id="calculator">48 - 12</gadget>
<output>36</output>

<result>36</result>