The sum of three numbers is 210. If the ratio between the first and second be 2 : 3 and that of between the second and third be 4 : 5, then find the second number. |
105 90 72 80 |
72 |
I : II : III : Total 2 : 3 4 : 5 ------------------------------------------------- 8 : 12 : 15 : 35 35R = 210 1R = 6 12R = 12 × 6 = 72 |