Entry Exam Category: High School Equivalency Exams
Course: General Education Development (GED)
Exam: GED Math practice test
Practice Question
The mass of an amoeba is approximately 4.0 × 10^(-6) grams. Approximately how many amoebas are present in a sample that weighs 1 gram?
Answer Choices
- A: 2.5 × 10^5
- B: 4.0 × 10^7
- C: 4.0 × 10^5
- D: 2.5 × 10^7
Correct Answer: A
Rationale: To find the number of amoebas, divide the total mass (1 gram) by the mass of one amoeba (4.0 × 10^(-6) grams): 1÷ (4.0 × 10^(-6)) = 1 * (10^6 / 4.0) = 10^6 / 4 = 0.25 × 10^6 = 2.5 × 10^5. Thus, the correct answer is 2.5 × 10^5.