2.5b+5r = 80 The given equation describes the relationship between the number of birds, b, and the number of reptiles, r, that can be cared for at a pet care business on a given day. If the business cares for 16 reptiles on a given day, how many birds can it care for on this day?
Correct answer: A (parsed from the explanation — this source omits an answer key for this item)
Explanation
Choice A is correct. The number of birds can be found by calculating the value of = b when r 16 in the given equation. Substituting 16 for r in the given equation 36 SAT PRACTICE TEST #4 ANSWER EXPLANATIONS SAT ANSWER EXPLANATIONS nnn MATH: MODULE 1 ( +) = + = yields 2.5b 516 80, or 2.5b 80 80. Subtracting 80 from both sides of = this equation yields 2.5b 0. Dividing both sides of this equation by 2.5 yields = b 0. Therefore, if the business cares for 16 reptiles on a given day, it can care for 0 birds on this day. Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from conceptual or calculation errors. Choice D is incorrect and may result from conceptual or calculation errors.
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