Subtract 2.1 to both sides:
Answer:
r = 16.5
Step-by-step explanation:
To solve for r we have to isolate it. Add 1 to both sides first.
0.1r - 1 = 0.65
0.1r = 1.65
Divide 0.1 from both sides.
r = 16.5
30 members....21 girls and 9 boys
ratio of girls to boys is : 21/9 which reduces to 7/3 or 7:3 or 7 to 3
The quotient is the number 13!!!!!!!!!!!!!