Given, the common difference of AP i.e., d = 5

Now,

As we know, nth term of an AP is

a_{n =} a + (n - 1)d

where a = first term

a_n is nth term

d is the common difference

a₁₈ -a_{13 =} a + 17d – (a + 12d)

= 5d

= 5(5)

= 25