exam Maths Puzzle Numerical Ability

Find the following power. Express your answer in scientific notation.
(5 X 10 to the 3rd power) -1 power

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exam Other Question

The four Baldwin Brothers have a total age of 136 and their ages are represented by consecutive odd intergers. What are the ages of all four brothers? The time t required to drive a fixed distance varies inversely as the speed r. It takes 5hr at 55mph to drive a fixed distance. How long would it take at 40mph?