exam Maths Puzzle Numerical Ability

In a survey of 75 resorts, it was reported that:
34 provided refrigerators in the guest rooms
30 provided laundry services
37 provided business centers
15 provided refri

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exam Other Question

On a round trip of 700km in each direction,Mr.anderson averaged 7km/h more returning than he did going.If the return trip took 5hours less than the trip going, find the time he spent traveling in each direction Please help!

Factor the polonomial completely:

a^2-2a+ab-2b