Hello I am new and have unfortunately not so good english knowledge. how do I program something like this. according to this formula is the most in my test program to run. I would appreciate any help.

The algae tank

Principle of the algae tanks

water + algae cultures + nutrient + light
= seaweed

Description:

A cylinder is filled with 5 liters of water, 100 g and 0.1 units of algal nutrients
By light and the addition of the three elements to grow seaweed.
For the above-mentioned elements are 20 units at the end of algae. The tank holds
max. 20 liters and switches to standby when an item consumed and the tank is full
is. The removal from the tank contains 3 units each algae.
You can add above-mentioned elements.

Equation 0.25 l water, 25 grams of nutrients and light grows one unit of algae in one houre.

thx for any help