I am confused, thank you very much for giving 3j to a friend

I am confused, thank you very much for giving 3j to a friend

Use Alchemy to mend the sky, gently shake the old vines with burned hands
It's not just being irresponsible for your own life
Sunshine brings peace
Even if you exist or not
Ah, the voice is falling until it disappears; the dream is blurring until it disappears

According to the formula, add appropriate conditions
There are 240 bags of rice, () and how many bags of flour in the grain store?
① 240 times one fifth condition ()
② 240 divided by one fifth condition ()
③ 240 times (1 + 1 / 5) condition ()
④ 240 times (1-fifth) condition ()
⑤ 240 divided by (1 + 1 / 5) condition ()
⑥ 240 division (1-fifth) condition ()

Flour is one fifth of rice
Rice is one fifth as much as flour
Flour is one fifth more than rice
Flour is one fifth less than rice
Rice is one fifth more than flour
Rice is one fifth less than flour

How to determine whether its unit 1 is known or unknown? For example, the incubation period of a duck is 28 days, and that of a goose is 14 / 15 of that of a goose. Is its unit 1 known or unknown? Why
Should we multiply directly or use equations

The title is wrong
The hatching period of ducks is 14 / 15 of that of geese
Usually, the unit "1" is after "yes", "Zhan" and "equivalent",
Unit "1" is goose, unknown, division
28 / 14 / 15 = 28 x 15 / 14 = 30 (days)