exam Maths Puzzle Numerical Ability

find two numbers with a sum of 15 and a differnce of 4.

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I have another one and I am having the same arguement with my friend. I say these have to be turned into inproper fractions before adding am I correct? Thanks so much for your help.

5 4/5 + 4 5/6 + 1 3/10 = in a bridge club, there are three more women than men. how many people are members of the club if the probability that a member chosen at random, is a woman is 3/5?