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Math·Algebra·Linear equations in two variables

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An aquarium uses small and large tanks to temporarily hold a total of 37 fish. Each small tank holds 1 fish, and each large tank holds 2 fish. Which equation represents this situation, where $s$ is the number of small tanks and $b$ is the number of large tanks the aquarium uses?

A

$s+2b=37$

B

$s+b=37$

C

$2s+b=37$

D

$2s+2b=37$