book Maths Puzzle Numerical Ability

A 15 foot ladder is leaning against a wall. It's base is moving at a constant rate of 2 ft per second away from the wall. What is the rate of change of the area formed by the lad

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What is the correct way to find the sum of 1+4+7+10+13......100 The cost of a taxi ride is calculated by adding a fixed amount to a charge for each 1/4 mile of the trip. If a one mile trip costs $4.00 and 1 and 1/2 mile trip cost $5.50 , what will be the costs of a 3 mile trip?