Which number produces an irrational number when added to 2/5

Any irrational number when added

to 2 / 5 still produces an irrational number.

For example, if we use π to add to 2/5

or 0.4. As far as we know the decimal digits for π just go on forever and do not

have a repeating cycle hence making it an irrational number. Adding a rational

number such as 0.4 to

the value of π

does not really greatly change the value of π. The decimal digits (hundredths place and so on) of

the resulting number will still go on forever without a continual repeat.

So 0.4 + π is

still irrational