Question

If the rule says I should mix 1 cup of fertilizer in every 1 gallon of water, how much fertilizer should I mix in 1 litre of water?

Answer 1

1 gallon = 16 cups

1 cup = 1 / 16 gallons

Proportion is:

1 cup of fertilizer / 1 gallon of water = 1 / 16

This proportion will also apply to liters.

1 / 16 liter of fertilizer / 1 liter of water

0.0625 liter of fertilizer / 1 liter of water

Since:

1liter = 1000 mililiters you can write the result as

62.5 mililiters of fertilizer / 1 liter of water