Question

Which number produces a rational number when added to 0.25?

A. Pie
B. 0.54732871......
C. 0.45
D. -√15

Answer 1

C. Would be the best answer 

Answer 2

A rational number is defined as any number which can be expressed in fractional p/q of two integers, where 'p' is the numerator and 'q' is the denominator. 'q' can never be zero. A rational number can also be expressed as a terminating decimal.

So, when 0.25 is added in 0.45 it becomes 0.65 which is rational.

So, option C is correct.