book Maths Puzzle Numerical Ability

On a 225-mile trip, Gary traveled at an average speed of 70mph, got a speeding ticket, and then traveled at 60 mph for the remainder of the trip. If the entire trip took 4.5 hours

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In the numbers 1 through 100, which digit appears the most? While you�re at it, in that same set of numbers, which digit appears the least? A specialty coffee store creates a special mix of two coffees at two different prices: $6.42 and $7.28 per pound each. How many pounds of the $7.28 coffee should be mixed with 7 pounds of $6.42 coffee to sell the mixture for $7.20 per pound?