book Maths Puzzle Numerical Ability

Can someone help me with this problem?

(Round to the nearest hundredth)
7 L = ____________ qt

Thanks,
Sher

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book Other Question

Can you help with this non-linear systems of equations
X^2 - Y^2 = 32
X - Y = 8

Thank you in advance.
How do u solve systems of equations by elimination. Help its for my mid-term review sheet.