exam Maths Puzzle Numerical Ability

The horse is tethered to a rope, at one end of a square corral(outside the corral) 10 feet on a side. The horse can graze at a distance of 18feet from the corner of the corral where the rope is tied. What is the total grazing area of the horse.

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radio towers A and B, 200 kilometers apart, are situated along the coast, with A located due west of B. Simultaneous radio signals are sent from each tower to a ship, with the sign A person invested $17,000 for one year, part 10%, part at 12%, and the remainder at 15%. The total annual income from these invested was $2110. The amount of money invested at 12%