exam Maths Puzzle Numerical Ability

how do u do this 10 to the negative 2nd power?

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exam Other Question

Find the values of the positive numbers a and b, given that a is 8 times the size of b and the reciprocal of ab is 1 less than 3. A park has two sprinkers that are used to fill a fountain.One sprinker can fill the fountain in 3 hours and the second sprinker can fill the fountain in 6 hours. How long will it take to fill the fountain with both sprinkers operating.