Two tenths equals one fifth..
One-fifth equals 0.2 it could be rounded to zero
one fifth
1/5 times (of means times in math) 1000 equals 200.
One over two to the fifth power equals 50,000
one-fifth of a ton is 400 pounds
2.5
1/5 (one fifth)
1/30th
one fifteenth
If I am understanding your question correctly, the answer would be 10. One-fifth goes into 1 five times (five fifths equals one), and into 2 ten times.
One fifth of 30 always equals 6