Blue marbles, green marbles and red marbles are in a ratio of 5 to 7 to 8 in a box. If the total number of marbles is 240, how many green marbles are in the box?
A. 81
B. 83
C. 84
D. 86
E. 90
A. 81
B. 83
C. 84
D. 86
E. 90












