Notice that the ratio male to female is 3 : 5
which means 3 males per 5 females.
If there are 120 members, then to find the number of males, we need to use the fact that the ratio 3:5 means that if one has a TOTAL of 8 people, 3 are males and 5 are females.
Then the ratio of males to the TOTAL number of 8 people is: 3/8
We use this rate 3 males / 8 male&female to estimate how many males are in the 120 total number of members (males and females included)
We write the following proportion:
3 males / 8 m&f = X males / 120 m&f
we multiply by 120 on both sides in order to isolate the unknown (X number of males):
3 * 120 / 8 = X
that is:
X = 360 / 8
X = 45
Then there are 45 males in the total league members.