<span>Denote x as the interval, then:
186 = 50 + 3 + (3+x) + (3+2x) + (3+3x) + (3+4x) + (3+5x) + (3+6x) + (3+7x)
186 = 74 + 28x
x = 4
Age of the eldest son = 3+7x = 3+28 = 31.</span>
Answer:
40%
Detailed solution:
John Smith and Susan Jones have contributed $240,000 and $160,000 respectively toward Expo Company. We are tasked with determining the proportion of the business owned by Susan.
First, calculate the total investment by summing both contributions.


Next, find what percentage $160,000 is of the total $400,000.



Thus, Susan's share in the company is 40%.