The sum of three numbers is 1050 . If the ratio between the first and second be 5 : 4 and that of between the second and third be 3 : 2 , then find the third number.

240

   I     :      II      :      III      :    Total

   5    :       4

                 3      :        2  

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

  15     :       12      :       8     :    35

35R = 1050

1R = 30 

8R = 8 × 30 = 240