Sprouts in a jar

You need fifty grams of dry mung beans, a clean jar, a piece of cloth and water. This is the easiest garden there is, because it grows indoors.

You need $50\mathrm{g}$ of dry mung beans, a jar, a cloth and water. It is a garden that grows indoors.

beans $B_0=50\mathrm{g}$.

Soak the beans for eight hours in one hundred and fifty millilitres of water, which is three times their weight. Then pour the water away and cover the mouth of the jar with the cloth.

Soak the beans for $8\mathrm{h}$ in $3\times 50=150\mathrm{mL}$ of water. Pour the water away and cover the jar with the cloth.

water $W=3B_0=150\mathrm{mL}$, soak $8\mathrm{h}$.

Rinse the beans twice a day, morning and evening. Four days make eight rinses. Keep the jar in the shade.

Rinse twice a day for $4$ days: $2\times 4=8$ rinses. Keep the jar in the shade.

$2\times 4=8$ rinses.

After four days the beans have grown tails, and the fifty grams have become about two hundred and fifty. A small handful has turned into a bowlful, five times the weight, from nothing but water.

After $4$ days the weight is about $5\times 50=250\mathrm{g}$: a handful became a bowlful, from nothing but water.

$B_4=5B_0=250\mathrm{g}$.