The weight of Xiaojun’s grandfather is 50 kg, Xiaojun is lighter than his grandfather (1/5), and his father is heavier than Xiaojun (5/8). How many kilograms does dad weigh?
小军爷爷的体重是50千克，小军比爷爷轻(1/5)，爸爸比小军重(5/8)．爸爸有多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 + (5/8)</gadget>
<output>13/8 = around 1.625</output>

<gadget id="calculator">50 * (4/5) * (13/8)</gadget>
<output>65</output>

<result>65</result>