To take 2/5 of 15, we have to multiply them.
`2/5 * 15`
To multiply, express 15 as a fraction.
`=2/5 * 15/1`
Then, cancel common factor between numerators and denominators.
`=2/1*3/1`
And, multiply straight across.
`=(2*3)/(1*1)`
`=6/1`
`=6`
Therefore, 6 is ` 2/5` of 15.