book Maths Puzzle Numerical Ability

Use the binomial theorum to find the fifth term in the expansion (2x+3y)^5.

Thank You

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book Other Question

If 64 feet of rope weighs 20 pounds, how much will 80 feet of the same rope weights? Can someone please help find the LCM
(x-1)^3(x+1); (x-1)(x+1);(x-1)^2(x+1)^2

Thanks for your help.