Question

A scientist uses 3/4 of an ounce of sulfuric acid each day. How many days does it take him to empty a jar, if each jar contains 24 ounces of sulfuric acid ?

Answer 1

32 days

Explanation:

Assume that the jar is full initially, containing 24 oz. After how many withdrawals of 3/4 oz will the jar be empty?

24 - (3/4)n = 0, or

24 = (3/4)n, or 96 = 3n. Dividing both sides by 3, we get n = 32.

The jar will be empty after 32 days.