After the original rice in the school cafeteria is used (2/5), another 90 kg is bought, which is the same amount as the original rice. How many kilograms of original rice in the canteen?
学校食堂原来的大米用去(2/5)后，又买进90千克，这样和原来大米同样多．食堂原有大米多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">90 / (2/5)</gadget>
<output>225</output>

<result>225</result>