Answer: Look below
Step-by-step explanation:
1(10x-6y)=-16
3(5x+2y)=66
10x-6y=-16
15x+6y=66
-25x=50
x=-2
Boys / girls : 3/8 = 21 / y
ANSWER

EXPLANATION
The number of green marbles in the bag is

The total number of marbles in the bag is

The probability of selecting a green marble from the bag without looking is

Substitute the values to get,


1. 5 inches
2. 18 2/3 ft. (19)