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Expert replies
by camitava » Sun May 25, 2008 9:05 pm
Guys help me on this Qs - Did not understand so need explanation too ---

17. Seventy percent of the 30,000 trees in an orchard are apple trees, and the rest are pear trees. What percent of the trees in the orchard were planted this year?

(1) The number of apple trees that were planted prior to this year is 14 times the number of pear trees that were planted this year.

(2) The number of pear trees planted prior to this year is 8 times the number of pear trees that were planted this year.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT SUFFICIENT
Correct me If I am wrong


Regards,

Amitava
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Source: — Data Sufficiency |

by simplyjat » Sun May 25, 2008 10:51 pm
Lets start with the stem "Seventy percent of the 30,000 trees in an orchard are apple trees, and the rest are pear trees"

apple trees = 0.7 * 30,000 = 21,000
pear trees = 30,000 - 21,000 = 9,000

Statement 1.
Let apple trees planted this year = X
then apple trees planed prior to this year = 14X.
Also 14X + X = 15X = 21000 => X = 1400
but we need to know the number of pear trees planted as well thus INSUFFICIENT

Statement 1.
Let pear trees planted this year = Y
then apple trees planed prior to this year = 8Y.
Also 8Y + Y = 9Y = 9000 => Y = 1000
but we need to know the number of pear trees planted as well thus INSUFFICIENT

Joining both statements X + Y = 2400 Ans...
simplyjat
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by camitava » Mon May 26, 2008 2:42 am
Got it, Simplyjat!
Correct me If I am wrong


Regards,

Amitava
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