SOLUTION: I really would appreciate your help understanding problems like the one below:
Marie Mulroney has a rectangular board 12 inches by 16 inches around which she wants to put a unif
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Question 1111156: I really would appreciate your help understanding problems like the one below:
Marie Mulroney has a rectangular board 12 inches by 16 inches around which she wants to put a uniform border of shells. If she had enough shells for a border whose area is 128 square inches, determine the width of the border.
Found 2 solutions by josmiceli, ikleyn:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
There is a border on both sides of the 12 in
side, so that each side is in long
Also, there is a border on each side of the
16 in side, so this side is in long
-------------------------------------------
Add up the inside area and the ares of the border.
in2
----------------------------
Now I can say:
( by observation )
( can only use the positve result )
The width of the border is 2 in
-----------------------------------
check:
OK
Answer by ikleyn(52803) (Show Source): You can put this solution on YOUR website!
.
If you want to see other similar solved problems, look into the lessons
- Problems on the area and the dimensions of a rectangle surrounded by a strip
- Problems on a circular pool and a walkway around it
in this site.
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