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velikii [3]
3 years ago
11

Bill Gates wants to construct an in ground swimming pool for his dog. he wants it's length to be 8 yards shorter than twice it's

width. he then wants to surround it with a concrete walkway 6 yards wide. he can only afford 570 square yards of concrete. what should the dimensions be of the pool ?

Mathematics
2 answers:
rosijanka [135]3 years ago
6 0

Please find the attached file for a better understanding of the solution provided here:

ABCD is the swimming pool and PQRS is the extent of the swimming pool plus the concrete walkway which is 6 yards wide.

Now, we know that the length is 8 yards shorter than twice it's width. Thus,

l=2w-8

Now the area of the region, A'B'QP will be: length x width. Now, the length here is l+6+6=2w-8+12=2w+4 and width is 6.

Thus, area of the region A'B'QP is (2w+4)x6=12w+24

Likewise, the area of the region D'C'RS will similarly be 12w+24 too.

Now, the area of the region BB'C'C will be 6 x w=6w

Similarly, the area of the region AA'D'D will be 6 x w=6w

Therefore, the total area of the walk way will be:

2(12w+24)+2\times 6w=570

24w+48+12w=570

36w+48=570

\therefore w=14.5

Therefore, length, l will be:

l=2w-8=2\times 14.5-8=29-8=21

Therefore, the dimensions of the swimming pool are:

Length, l= 21 yards and Width, w=14.5 yards


nasty-shy [4]3 years ago
6 0
The dimensions of the pool should be 34
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