Answer:12
Step-by-step explanation:They are adding three box for every building so is the fifth block you do it
It's A because 8-15 is -7 but the absolute value parenthesis make it positive 7.
The common ratio of 2, 10/3, 50/9 is 
<u>Solution:</u>
Given, series of elements are 
We have to find the common ratio of the above given series.
We know that, common ratio of an G.P is division of any number in that series with the previous number of the series.
So, now take
and 2


Hence, the common ratio of the given series is 
The answer is 8
Happy studying!