X number of students in a class agreed to donate a total of tk z to a charity.if 4 students drop out,how much more will each of the rest have to contribute so that the total donation remains the same?
সমাধান
সঠিক উত্তর: Option B
Among x students each one gave z/x taka
after leaving four ,
total students (x-4) each of them gave z/x-4 Taka z/x-4-z/x =zx-z(x-4)/x(x-4)=4z/x2-4x
