10 kilograms of peanut kernels can extract 4.5 kilograms of peanut oil. According to this calculation, how many kilograms of peanut kernels are needed to squeeze 25 kilograms of peanut oil?
10千克的花生仁可以榨油4.5千克的花生油，照这样计算，榨25千克的花生油，需要花生仁多少千克？
<gadget id="calculator">25 / 10</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * 4.5</gadget>
<output>11.25</output>

<result>11.25</result>