Q) Susan wants to put up fencing around three sides of her
rectangular yard and leave a side of 20 feet unfenced. If
the yard has an area of 680 square feet, how many feet of
fencing does she need?
a) 38
b) 44
c) 72
d) 88
e) 97
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Answer / anirudh
Asnswer Is 88.
Explanation :-
Rectangle has 4 sides with opposite sides equal in length. Let these be a,b
Now, we are given area as 680
ie. a*b=680
If a=20, then b=34
Now fencing is to be done on 3 sides leaving one a side i.e 2b+a
2*34+20 =88
| Is This Answer Correct ? | 26 Yes | 0 No |
Answer / santhoshi
lb=680;
l*20=680;
l=34;
three sides fencing =2 sides length + one side breadth.
=2*38 + 20
=88;
so answer "d";
| Is This Answer Correct ? | 8 Yes | 0 No |
Answer / kishor
Area =length x breadth
breadth=20
area given=680
length=area/breadth=680/20=34
so when 20 ft.side is to be left only two length side and 1 breadth is to be fenced so
2x34+20=68+20=88 ft.
| Is This Answer Correct ? | 2 Yes | 0 No |
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