exam Maths Puzzle Numerical Ability

simplify
5 sqrt 5 - sqrt 20

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Hello, I have this problem to solve, but I don't quite understand how to start it. Could you please help me with this.

Suppose that the number of cars, C, on 1st Avenue in a Find the value of the digit A if the 5-digit number 12A3B is divisible by both 4 and 9, and A =/ B.