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Additive Identity & Additive Inverse

Using Roman n...

Question

Using Roman numerals, find the value of XXX + XL.

A

LCX

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B

LLX

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C

LXX

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D

XX

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Solution

The correct option is C
LXX

In Roman numerals X = 10, L = 50.
So, XXX = 10 + 10 + 10 = 30
XL = 50 - 10 = 40
XXX + XL = 30 + 40 = 70
70 = LXX (In Roman numerals L= 50)
Therefore, XXX + XL = LXX

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