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Math·Algebra·Systems of two linear equations in two variables

hard

At a constant temperature, a scuba diver combines two different concentrations of nitrox mix (oxygen-nitrogen gas mixture) to fill a tank to a total pressure of 90 atmospheres (atm), of which 37% is contributed by oxygen. Nitrox mix A contributes $x$ atm of pressure to the tank, of which 22% is contributed by oxygen. Nitrox mix B contributes $y$ atm of pressure to the tank, of which 49% is contributed by oxygen. Which system of equations represents this situation?

A

$x+y=90$, $0.22x+0.49y=0.37(90)$

B

$x+y=90$, $0.49x+0.22y=0.37(90)$

C

$x+y=0.37(90)$, $0.22x+0.49y=90$

D

$x+y=0.37(90)$, $0.49x+0.22y=90$