Question by Lê Quốc Trần Anh - Discuss with MathYouLike

Lê Quốc Trần Anh Coordinator

16/03/2018 at 07:41

David’s optometrist sold him a bottle of eyeglass cleaner containing 30 mL of glasscleaning solution. Assuming there are 20 drops per milliliter, and assuming proper cleaning requires 3 drops of glass cleaner on each side of each lens, what is the maximum number of times David can properly clean his glasses before he must buy a new bottle of eyeglass cleaner?

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Doan Le Minh Hong moderators 19/03/2018 at 16:18

The total number of drops in a bottle is: \(20 \times 30=600 \)

The total number of drops used in each time David properly clean his glasses is: \(3\times2\times2=12\).

So the maximum number of times is: \(300\div12=25\).

The answer is \(25\).
Lê Quốc Trần Anh selected this answer.

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