B. The perimeter of any shape is all the sides added together. The perimeter given is the perimeter of the quadrilateral, and we are to find the other side. We are given values of three sides. We can find the value of the other side by subtracting the sum of those three sides from the total perimeter:
Consecutive integers = in this situation double-digit whole numbers
So as there are 3 of them let's say 2 are 11 because that would be the highest consecutive number so 11+11= 22 and 48-22=26 so the three have the ages of 11,11,26 and the oldest would be 26 ;)