Question 24505
If ratio of boys to girls is 7:8, there are "7x" boys to "8x" girls.
The total number in the group is therefore 15x.
If the ratio of one less girl (8x-1) to total number of members (15x)
is 1:2 you get the following equations:
(8x-1)/15x=1/2
16x-2 = 15x
x=2
7x=14 (number of boys)
8x=16 (number of girls)

Cheers,
Stan H.