There are 600 boys in a hostel. Each plays either hockey or football or both. If 75% play hockey and 45% play football, how many play both ?

a. 48
b. 60
c. 80
d. 120

• ((75*600)/100)+((45*600)/100)-600
  d.120
• 10 years agoHelpfull: Yes(6) No(1)
• 120 is the answer.450 members plays only hockey., 270plays only football. So both game players 120
• 7 years agoHelpfull: Yes(1) No(1)
• 120 use formula total=n(a)+n(b)-both(ab)+none(ab) here none(ab)=0 why because each plays either hockey or football or both.and here n(a)=75%of600,n(b)=45%of 600
• 7 years agoHelpfull: Yes(0) No(0)
• n(a') [75/100*600] =450
  n(b') [45/100*600]= 2700
  n(aub)= 600
  n(au b)= na+nb- a union intersect b
  450+270-600
  =120 ans
• 3 Months agoHelpfull: Yes(0) No(0)