book Maths Puzzle Numerical Ability

I am really stumped on this one. okay its
[12sqrt20]/4[sqrt3]

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book Other Question

In a football game, the quaterback is 15 yards away from making a first down and is running 264 yards per minute. Within 0.03 of a minute later, a linebacker on the opposite side Solve the following:


5 / x - 1 + 3 / 7x - 7 = 2/3


I think you have to change the 7x - 7 to 7(x -1) so you have a common denominator of (x-1) Do you then multiply both s