exam Maths Puzzle Numerical Ability

How do you write 10.9 in Roman Numerals? I know how to write the 10, but am unsure of how the decimals are done.

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exam Other Question

For the equation x - --x = 0, how do I solve for all values of x that satisfies the equation? A rectangular room is 1.3 times as long as it is wide, and its perimeter is meters. Find the dimension of the room.

what is the length in meters
what is the width in meters