exam Maths Puzzle Numerical Ability

Can someone please help me with this problem I just don't get it and I have tried it. If P = 7y + 2xy - 6x and Q = 5 - 7y, find the value of 3P - 4Q.

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exam Other Question

N-(-6)=4 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?