3 kilograms of sesame seeds can extract (4/5) kilograms of oil, how many kilograms of sesame seeds are used to squeeze 1 kilogram of oil.
3千克芝麻可榨油(4/5)千克，榨1千克油要用多少千克芝麻．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / (4/5)</gadget>
<output>15/4 = around 3.75</output>

<result>15/4 = around 3.75</result>