Final answer:
To convert the ratio 20 months to 3 years to a decimal, divide 20 months by 12 to convert it to years, then divide the result by 3.
Step-by-step explanation:
To write the ratio 20 months to 3 years as a decimal, we need to convert both time units to the same unit. Since there are 12 months in a year, 20 months is equivalent to 20/12 = 1.67 years. Now we can rewrite the ratio as 1.67 years to 3 years. To convert this ratio to a decimal, we divide 1.67 by 3, which gives us approximately 0.56. Therefore, the correct answer is Option A) 0.56.
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