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So, at the beginning there are a total of 25*3=75 siblings (we can assume that each of them had exactly 3 siblings, that's what average means; that we can assume this).
Now we have 25+1=26 students and the number of siblings is 75+8=83
and the average is
, and rounded it's 3.19.
Now we have 25+1=26 students and the number of siblings is 75+8=83
and the average is
We can calculate the width of the rectangle patio with pythagorean theorem:
Then, she need to put trim on the edge of the floow of the patio that is wood planks and DOES NOT share and edge with the brick part:
Loretta need to put 28 feet of trim.