Dear Dipti,
Here is the solution to your query:
Ratio of males to females workers is = 3:4
No. of female workers = 28
Now to find the number of male workers, we can tell it as:
Number of males working in the office = (28 x 3)
4
= 7 x 3 = 21 -- (ANS)
Hope it helps!
Thumbs up if it helps!
Regards!