Question

i am greater 15 and less than 40 if you double me i become a number that ends in 0 1/5 of me is equal to 5 what am i

Answer 1

the only numbers that end in 0 when you double them have to end in 5.

and there's only two numbers greater than 15 and less that 40 that end in 5: 25 and 35

now it's trial and error.

does 1/5 of 25 equal 5?? yes

does 1/5 of 35 equal 5?? no

therefore the answer must be 25

hope this helps!