For three numbers, the ratio of the first and the second numbers is 2 : 3 and that of the second and the third number is 4 : 5. If the sum of the three numbers is 140, then what is the second number?

48

 I  :  II  :  III

 2 :  3

        4  :  5

__________

 8  : 12 : 15

Sum of these numbers = 35r = 140

                                        r = 4

The second number = 12r = 12 x 4 = 48