To answer, we let x be the 4th term. We use the concept of geometric mean in order to answer this question. The ratio of the fourth term and the third term is equal to the ratio of the fifth term and the fourth term. That is, x/40 = 10/x The values of x from the equation are 20 and -20.
Lets say there were 100 people and 40 ate sandwiches on the first day then 25 percent of 40 is 10, so 10 had sandwiches two days in a row i would say it is true
