Correct Answer: C
Explanation:
Arithmetic Percents
The surveyed companies could be placed into one
of the following four categories:
- Requiring computer skills and requiring writing skills
- Requiring computer skills but not requiring writing skills
- Not requiring computer skills but requiring writing skills
- Not requiring either computer skills or writing skills
It is given that 20 percent of the surveyed
companies fell into category 1. It is necessary to
determine what percent of the surveyed
companies fell into category 4.
- (1) This helps identify the percentage in
category 2. Since -4 the companies that required
computer skills also required writing skills
(i.e., those in category 1), then the other -=
of the companies that required computer skills
did not require writing skills (thus category 2 =
category 1). However, this information only
establishes that 20 percent required computer
skills, but not writing skills; NOT sufficient.
- (2) While this establishes category 3, that is,
that 45 percent required writing skills but not
computer skills, no further information is
available; NOT sufficient.
Taking (1) and (2) together, the first three
categories add up to 85 percent (20 +20+45).
Therefore, category 4 would be equal to 100- 85=
15 percent of the surveyed companies required
neither computer skills nor writing skills.
The correct answer is C;
both statements together are sufficient.