If a bag of rice is 50 kilograms, if you plan to eat it in 15 days, you will eat this bag of rice in 10 days ((())/(())). The person who actually eats this bag of rice every day (1/10) can eat this bag of rice in a few days (4/5).
一袋大米50千克，计划15天吃完，则10天吃了这袋大米的((())/(()))．实际每天吃这袋大米的(1/10)，多少天就能吃这袋大米的(4/5)．
<result>8</result>