Sundials sometimes use Roman numerals.
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Just as we can add, subtract and multiply numbers, so can we do the same with Roman numerals. Let’s look at the following example:
D is the same as 500
C is the same as 100
L is the same as 50
IX is the same as 9
X is the same as 10
DCC is the same as 500 + 100 + 100 = 700
LIX is the same as 50 + 9 = 59
XXIX is the same as 10 + 10 + 9 = 29
700 - 59 = 641 + 29 = 670
“670” in Roman numerals is “DCLXX.” “D” equals 500, “C” equals 100, “L” equals 50 and “XX” equals 10 + 10 = 20, giving us 500 + 100 + 50 + 20 = 670. Answer (d) is the correct answer