ISEE Mathematics Achievement Question 325: Answer and Explanation
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Question: 325
9. Lori is 15 years older than Carol. In 10 years, Lori will be twice as old as Carol. How old is Lori now?
- A. 5
- B. 12
- C. 20
- D. 25
Correct Answer: C
Explanation:
C Be sure to label the choices very carefully to stay visually organized. The question asks for Lori's age now, so label the choices "L," and create another column to the right and label it "C" for Carol's age. Next, create two more columns and label them as "L + 10" and "C + 10" for their respective ages in 10 years. Now, Plug In starting with (C): if Lori is 20 years now, Carol must be 5 because Lori is 15 years older than Carol. This means that in 10 years, Lori will be 30 (20 + 10 = 30), and Carol will be 15 (5 + 10 = 15). The question states that in 10 years, Lori will be twice as old as Carol. 30 = 2 × 15, so this satisfies the statement. The correct answer is (C).