book Maths Puzzle Numerical Ability

Mrs.Beal, a retiree, will lose some retirement benefits is she earns over $8000 per year working as a baby-sitter. If she already earned $6500. for how many more hours may she work

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Safety Rent-a-Car rents an intermediate-size car at a daily rate of $21.95 plus .19 per mile. City Rentals rent an intermediate-size car for $18.95 plus .21 per mile. For what milage is the cost the same? A commercial airplane travelled 660 km with the wind in 1.375 h. it took 1.875 h to return the same distance against the wind. Find the airspeed of the palne and the windspeed.