exam Maths Puzzle Numerical Ability

m/(m-n)(m+n)/n+1/(m+n)^2

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exam Other Question

Help!!Is my solution correct?
If not, please let me know where I went wrong?
x^2-5x-14 divided by 4-x^2

My solution is 1-1 (x^2 - 4)

thanks a bunch!!! William shared his baseball card collection with his friends. He gave 25% to Tom, 1/6 to Hal, and .05 to Joe. If William originally had 60 cards in his collection, how many cards did he have left after sharing with his 3 friends?