In a class of 42 students, the ratio of the number of males to Females is 5:2.

How many females are in this particular class?

Let's denote the number of males as 5x and the number of females as 2x.

According to the given ratio, the total number of students is 5x + 2x = 7x.

Since the total number of students in the class is 42, we can set up the equation:

7x = 42

Solving for x:

x = 42 / 7
x = 6

Therefore, the number of females in the class is 2 * 6 = 12.

So, there are 12 females in this particular class.