exam Maths Puzzle Numerical Ability

I am stuck on thi one!!!
Solve for r

v=1/3pi*H^2(3r-H)

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{{{M(sum(1/n!,n=0,infinity))r^2(1/y)^(-1))}}}


{{{sqrt(x^2)(F/a)}}}


and


{{{H((ln(x)^a)/ln(x))((p^4+p^3-2p^ In a bottling company, a machine can fill a 2-liter (L) bottle in 0.5 second (s) and move the next bottle into place in 0.1 s. How many 2-L bottles can be filled by the machine in 2 h?