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Math·Algebra·Linear equations in two variables

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During a 6-day period, a weather station recorded a total of $2.3$ inches of rain and snow. During this period, the weather station recorded $r$ inches of rain and $s$ inches of snow. Which equation represents this situation?

A

$r+s=2.3$

B

$r-s=2.3$

C

$s-r=2.3$

D

$rs=2.3$