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# Two DS questions I want to put up for discussion- 1) If d

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Intern
Joined: 04 May 2009
Posts: 5
Two DS questions I want to put up for discussion- 1) If d [#permalink]

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06 Jun 2009, 23:17
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Two DS questions I want to put up for discussion-
1)
If d denotes a decimal is d>=0.5
1)When d is rounded to the nearest tenth,the result is 0.5
2)When d is rounded to the nearest integer ,the result is 1.

2)If n is a positive integer and k =5.1*10^n then what is the value of k?
1)6000<k<500,000
2)k^2=2.601*10^9

Manager
Joined: 14 May 2009
Posts: 189
Re: Two DS questions for discussion [#permalink]

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07 Jun 2009, 01:33
(1)

$$0.4<d<0.55 \longrightarrow$$ YES or NO

(2)

$$d >= 0.5 \longrightarrow$$ YES

Sufficient

$$B$$.

#2

$$k =5.1*10^n$$

$$m | k$$
$$0 | 5.1$$
$$1 | 51$$
$$2 | 510$$
$$3 | 5,100$$
$$4 | 51,000$$
$$5 | 510,000$$

(1) Sufficient, only one value, 51,000

(2) Sufficient as although we have a quadratic, $$k^2$$ implies +/- and k is positive so it only has one value

$$D$$
_________________

Intern
Joined: 04 May 2009
Posts: 5
Re: Two DS questions for discussion [#permalink]

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07 Jun 2009, 08:17
1
KUDOS
Yes,answers match mine with one very small exception-
you have written..
1)0.4<d<0.55 YES or NO
here i think the range will be
0.45<d<0.54
What do you think,,,,
Manager
Joined: 11 Aug 2008
Posts: 137
Re: Two DS questions for discussion [#permalink]

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08 Jun 2009, 09:05
I agree 1) is B
For 2)
Qs => k^2=26.01*10^2n = 2.601*10^(2n+1)
1/ => k=4 (suf)
2/ => 2n+1=9 =>n=4 (suf )
IMO: D
Re: Two DS questions for discussion   [#permalink] 08 Jun 2009, 09:05
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