Speed bumps are being placed at 20 foot intervals along a road 1015 feet long. If the first
speed bump is placed at one end of the road, how many speed bumps are needed?
(A) 49 (B) 50 (C) 51 (D) 52 (E) 53
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13 comments:
D
c i believe
i feel it is A
c is the answer,
1015/20=50.7
so approx 51.
C
C... 50.75 approx....51
the correct answer is ....D
1015/20 = 50.75, approximate to 51! So C is the answer.
there s no approximation required...its 51 as there is one initially at the begining of the road..then its 50 speed bumps along the road...for eg...at 0 m there s one.then at 20 there s another(totally 2)and at 40 one more (totally 3) and so on..so totally this way 51 bumps are required...there s no approximation involved in the problem
i belive the ans is 50 becoz in the case of speed bumps u need one for every 20m so for a total of 1015 u need 1015/20=50 and u wl place another one at 1020 but hav only 1015 so u dont need any othr speed bump so the ans is 50
u cant use approximations in this case tht concept doesnt apply here
1st @ 0 ,
2nd @ 20 ...,
5th @ 80.....
10th @ 180....,
50th @ 980....,
51st @ 1000 thats it....
no more speed bumps....
i think by calculation C is the correct answer
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