exam Maths Puzzle Numerical Ability

Find the value of the digit A if the 5-digit number 12A3B is divisible by both 4 and 9, and A =/ B.

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exam Other Question

(square root of x) +4=(square root of x+16) How do you solve for x: 3/2x+4x-3(2/3x+1/3-2)=2(5-1/2+3/2)also how do you solve for x: 2x+6x-4(3/2x+5)=4x-1/2+6x-5/2 please help me!?! Idont understand what and how to start the equation and how to get the answer.