TopScore Chem Question. Mistake in topscore or am I reading it wrong?

[TTTSandy]

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What is the final pressure of a gas that expands from 10L at 137K to 20L at 274K if its pressure was initially 5 atm?

To solve this problem I did:
5atm*10L*137K = P2*20L*274K
P2 = (5x10x137)/(20x274)

Top score's answer is:
P2 = (5x10x274)/(137x20)

Am I reading the question wrong? Or did top score make an error? The gas expands from 10L at 137K TO 20L at 274K.

 

[AlbinoPolarBear]

What is the final pressure of a gas that expands from 10L at 137K to 20L at 274K if its pressure was initially 5 atm?

To solve this problem I did:
5atm*10L*137K = P2*20L*274K
P2 = (5x10x137)/(20x274)

Top score's answer is:
P2 = (5x10x274)/(137x20)

Am I reading the question wrong? Or did top score make an error? The gas expands from 10L at 137K TO 20L at 274K.

Given:
P1 = 5 atm, P2 = ?
V1 = 10 L, V2 = 20 L
T1 = 137 K, T2 = 274k

(P1V1)/T1 = (P2V2)/T2
P1V1T2 = P2V2T1
P2 = (P1V1T2)/(V2T1)
P2 = (5x10x274)/(20x137)

topscore is right.