exam Maths Puzzle Numerical Ability

mp-4np+mq-4np
mx-2nx+my-2ny
3xr+3xs-yr-ys

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3.You recently started the paperwork to purchase your new home, and you were just notified that you can move into the house in 2 weeks. You decide to hire a moving company, but are A bus for school feild trip costs P624. Since the number of persons making the trip is 13 less the capacity of the bus, it costs P8 more per student than if the bus is filled. How many students are in the trip?