SAT Mathematics Practice Test 4

The ratio of life expectancy to gestation period for the animal represented by point A is approximately

7years

23days

or about 0.3 years/day, which is greater than the ratio for the animals represented by the other labeled points (the ratios for points B, C, and D, in units of years of life expectancy per day of gestation, are approximately

8

44

,

8

51

, and

10

51

respectively, each of which is less than 0.2 years/day).
Choices B, C, and D are incorrect and may be the result of errors in calculating the ratio or in reading the graph.