A. Rs. 30
Feedback From given data,
780 = 2m + 6w +8b
And m : w : b = 3 : 2 : 1
=> m = 3x Rs.w = 2x Rs.,
b = x Rs.
Subs these m, w, b values in 780 = 2m + 6w +8b
=> 780 = 2 (3x) + 6 (2x) + 8 x
=> 780 = 6x + 12x + 8x
=> 780 = 26x
=> x = 780 / 26
=> x = 30 Rs.
Thus, a boy will get Rs. 30