exam Maths Puzzle Numerical Ability

Find digits a and b such that the number 34a47b5893 is divisible by 99.

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exam Other Question

Please help me. I am having problem with this question.

1. If the diameter of a circle is 1.3 * (10)^-12 meters, then wha is the radius?

Thank you kindly. y=x^.02
logy=.02