There are 80 crayons, and there are fewer watercolors (3/8) than crayons. How many watercolors are there?
蜡笔画有80幅，水彩画比蜡笔画少(3/8)，水彩画有多少幅？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

<gadget id="calculator">80 * (5/8)</gadget>
<output>50</output>

<result>50</result>