Net Drawing of a Cylinder - Examples 1 and 2 - - - - MTH-2102

[@samuelmorrlson9005]

I have a math question. To kill the coronavirus I need : 5 teaspoons of bleach per 1 gallon water. How much bleach would that be for 1 cup or 1 pint of water? For use in a spray bottle. Is there an equation or system to use?

[@thefreemathtutor]

1 gallon = 16 cups. So 5 table spoons in 1 gallon means 5 tablespoons in 16 cups. make a proportion:
1/16=x/5
Cross-multiply to solve:
16x = 5(1)
16x = 5
x = 5/16 or 0.3125
Use 5/16 of a tablespoon or 0.3125 of a tablespoon.
Note 1: These calculations work with US gallons/US cups, and also work with imperial gallons/imperial cups. if using metric cups, the ratio is different.
Note 2: These calculations also work with liquid substances, (since the question implied water and liquid bleach). If measuring dry substances, the ratio is different.

[@thefreemathtutor]

(If you decide to use a pint rather than a cup, there are 2 cups in a pint, so you are therefore doubling the water and you will thus double the bleach. This gives 5/8 of a tablespoon or 0.625 tablespoons.)

[@samuelmorrlson9005]

@@thefreemathtutor Thank you for your generosity. I will keep this in my notes and practice it.