The sum of three numbers is 2360. If the ratio between the first and second be 3 : 4 and that of between the second and third be 5 : 6 , then find the second number.

800

   I     :      II      :      III      :    Total

   3    :       4

                 5      :        6  

-------------------------------------------------               

  15     :       20    :       24     :     59

59R = 2360

1R = 40

20R = 20 × 40 = 800