3 Boys and 7 girls can do a piece of work in 5 days, while 2 boys and 8 girls can do it in 6 days. Boys and girls are paid according to their output. If the daily wage of a boy is Rs. 30, then the ratio of daily wages of a boy and a girl will be?

13 : 3

ATQ,

          (3B + 7G) × 5 = (2B + 8G) × 6

              15B + 35G = 12B + 48G

                          3B = 13G

                    B  :  G = 13  :  3