exam Maths Puzzle Numerical Ability

Julie stone designed a rectangular patio that is 25 ft by 40 ft. This patio is surrounded by a terraced strip of uniform width planted with small trees and shrubs. if the area A of this terraced strip is 504 ft^2, find the width of x of the strip.

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2. A business invests $10,000 in a savings account for two years. At the beginning of the second year, an additional $3500 is invested. At the end of the second year, the account balance is $15,569.75. What was the annual interest rate? Marla begins waling at 3 mi/h toward the library. Her friend meets her at the halfway point and drives her the rest of the way. The distance to the library is 4 mi. How many hours did marla walk?