exam Maths Puzzle Numerical Ability

questions----- Evaluate 2x-3y when x=-5 and y=-4 ?

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A) How many 5 digit zip codes are possible? Assume all digits can be used
B) How many additional zip codes do we get by attaching an additional 4 digits? (Assume all digits can be Two trains are traveling toward each other and are 950 miles apart. One plane is flying at 170 mph .The other is flying at 210 mph. In how many hours will the planes pass each other?