exam Maths Puzzle Numerical Ability

Given P(a,b) and Q(3a,5b), what is the distance from R(3a,2b)to the midpoint of PQ? I got sqrta^2+b^2???

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solve: 1/x - 1/x+3 = 1/6 Tickets to a school dance cost $4, and the projected attendance is 300 persons. It is further projected that for every $0.1 increase in ticket price, the average attendance will de