RRB RPF RPSF SI and CONS Model Papers 5 with solutions

(4) Let the number of girls and boys in the class be a and b, respectively.
So, a + b = 50
and, 2a + 3b = 120
After solving, we get, a = 30 and b = 20
∴ Required ratio = 30 : 20 = 3 : 2