In an examination average mark of boys is 80 and girls is 60 and average mark of all students is 75 then find the number of boys in the class if number of girls is 18A54B52C65D105Answer: A. 54 Read Explanation: boys : girls = 15 : 5= 3 : 1since the number of girls is 18number of boys = 18 × 3 = 54 Read more in App