Concept: The question tests on the ability to solve a Word Problem
Solution:
Given 2O + 3A + 5B = 40 ... (1)
Also 3O + 5A + 9B = 64 ... (2)
To find the price of O + A + B
Multiplying the 1st equation by 1 and subtracting it from 2
2(2O + 3A + 5B) - (3O + 5A + 9B) = (2 * 40) - 64
4O + 6A + 10B - 3O - 5A - 9B = 80 - 64
O + A + B = 16
Option A