NIC Barber Written (Theory) ExamScientific ConceptsEasy
A barber is preparing a new batch of disinfectant solution. The manufacturer's instructions state to mix 2 ounces of concentrated disinfectant with 1 gallon of water. If the barber needs to make 3 gallons of solution, how much concentrated disinfectant is required?
- A6 ounces
- B12 ounces
- C8 ounces
- D4 ounces
Show answer & explanationAnswer & explanation
Correct answer: A. 6 ounces
The ratio is 2 ounces of concentrate per 1 gallon of water. If you need 3 gallons of water, you multiply the concentrate amount by 3 (2 ounces/gallon * 3 gallons = 6 ounces).
Why the other options are wrong
- B. 12 ounces would be for 6 gallons, not 3.
- C. 8 ounces would be for 4 gallons, not 3.
- D. 4 ounces would be for 2 gallons, not 3.
Disinfectant Dilution
The process of mixing concentrated disinfectant with water to achieve the correct working strength.
- Follow manufacturer's instructions precisely.
- Incorrect dilution can render disinfectant ineffective or damaging.
- Measured ratios ensure proper germicidal action.
Memory trick: Multiply the part by the whole.