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How far did Ken jump on his fifth and final attempt in the

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How far did Ken jump on his fifth and final attempt in the [#permalink]

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New post 19 Oct 2008, 19:23
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

How far did Ken jump on his fifth and final attempt in the state long jump finals?

(1) On his final jump, Ken exceeded the average length of his first four jumps by 2.5 feet.
(2) Ken’s final jump increased the length of his average (arithmetic mean) jump from 22.5 feet to 23 feet.

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Re: fifth and final attempt [#permalink]

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New post 19 Oct 2008, 19:35
looks like its B

you can multiply 22.5*4 and get 90
from there u can get 23*5 = 115

the difference is his last jump 25
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Re: fifth and final attempt [#permalink]

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New post 19 Oct 2008, 20:56
Answer is certainly (B).

We need to calculate the length of final jump.

a)It only tells that Ken exceeded the average length of his first four jumps by 2.5 feet.but we don't know about the first four jumps of Ken.

b)It tells Ken’s final jump increased the length of his average (arithmetic mean) jump from 22.5 feet to 23 feet.

This gives that total length of jump of first four was 4*22.5.
and finally the total for five was 5*23.

Hence the length of final jump was (5*23)-(4*22.5) thus B is sufficient.
Re: fifth and final attempt   [#permalink] 19 Oct 2008, 20:56
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How far did Ken jump on his fifth and final attempt in the

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