are 1/3 and 2/7: 2/5 and 2/7: 2/9 and 6/27 equivalent?Give reason.

Fractions in their simplest form are already understood that they are equivalent or not equivalent.

13 and 27 ; 25 and 27 are already in their simplest form.
》These are not equal to each other.

But, 29 and 627 are equal.
》Reduce 627 in the simplest form.
That is, 29 (HCF of 6 and 27 is 3)

》29 = 29
or, 29 = 69.

Hope I helped you.