book Maths Puzzle Numerical Ability

Find the area of a fenced yard with a length of 9 yards and width of 5 yards.

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From two kinds of corn meal, one costing $0.65/kg and the other $0.85/kg, a cattle farmer wishes to make a 100 kilogram mixture costing $0.76/kg. How many kilograms of each kind s The distance an object falls is directly proportional to the square of the time it has been falling. After 6 seconds it has fallen 1296 feet. how long will it take to fall 2304 feet?