exam Maths Puzzle Numerical Ability

How would I explain why 0.4 is greater than 0.39?

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exam Other Question

on this problem i dont understand how to do it theres no numbers in front of the letters can someone explain to me how it works?? Assuming that none of the solutions are undefined, simplify. The problem is a^2b^2c/(over)abc Can you help me simplify 2+3i/8i
Thank you