The number that produced a rational number when added to 1/5 is D. -2/3.
What is a rational number?
A rational number is a number that can be written as a ratio (or fraction) of two integers.
For example, when 1/5 is added to -2/3, it produces a rational number, -7/15, that remains as a fractional value.
Thus, the number that produced a rational number when added to 1/5 is D. -2/3.
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