Upon Examining the Contents of 38 Backpacks, It Was Found

question 42

Multiple Choice

Upon examining the contents of 38 backpacks, it was found that 23 contained a black pen, 27 contained a blue pen, and 21 contained a pencil, 15 contained both a black pen and a blue pen, 12 contained both a black pen and a pencil, 18 contained both a blue pen and a pencil, and 10 contained all three items. How many backpacks contained exactly one of the three writing instruments?

• A) 2
• B) 3
• C) 11
• D) 15

---

Definitions:

Autonomy

The right or condition of self-government, or in a more general sense, the capacity of an individual to make an informed, uncoerced decision.

Ritualism

The excessive or inappropriate repetition of rituals, typically seen in religious or cultural practices but can also reflect certain psychiatric conditions.

Primary Dentition

Refers to the first set of teeth in the growth development of humans and many animals, also known as baby or milk teeth.

Primary Dentition

The first set of teeth in the human dentition cycle, also known as baby or milk teeth, typically includes 20 teeth.