book Maths Puzzle Numerical Ability

On a recent safari, a group of people and elephants contained 100 knees and 100 trunks. If each person took 3 trunks, how many people and how many elephants went on the safari?

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book Other Question
On Saturday morning, Lynn walked for 2 hours and then ran for 30 minutes. If she ran twice as fast as she walked and she covered 12 miles altogether, then how fast did she walk? A right triangle has one leg that is 5 centimeters longer than the other leg. The hypotenuse is 25 centimeters long. Find the length of each leg of the triangle.