Question a-cert
A certain elephant weighs 200 pounds at birth and gains more than 2 but less than 3 pounds per day during its first year. Which of the following inequalities represents all possible weights w, in pounds, for the elephant 365 days after birth?
A certain elephant weighs 200 pounds at birth and gains more than 2 but less than
Hard-difficulty · SAT Math · Linear Inequalities in One or Two Variables — Compound inequalities. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice D is correct. It’s given that the elephant weighs 200 pounds at birth and gains more than 2 pounds but less than 3 pounds per day during its first year. The inequality 
represents this situation, where d is the number of days after birth. Substituting 365 for d in the inequality gives 
, or .
Choice A is incorrect and may result from solving the inequality 
. Choice B is incorrect and may result from solving the inequality for a weight range of more than 1 pound but less than 2 pounds: 
. Choice C is incorrect and may result from calculating the possible weight gained by the elephant during the first year without adding the 200 pounds the elephant weighed at birth.
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