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Last year Mrs. Long received $160 in dividends on her shares of Company X stock, all of which she had held for the entire year. If she had had 12 more shares of the stock last year, she would have received $15 more in total annual dividends. How many shares of the stock did she have last year?

(A) 128
(B) 140
(C) 172
(D) 175
(E) 200

Breaking Down the Info:

$15 relative to $160 is \(\frac{15}{160} = \frac{3}{32}\) more. Then 12 more stocks is also \(\frac{3}{32}\) more stocks.

Thus there must be \(12 * \frac{32}{3} = 128\) stocks originally.

Answer: A
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Bunuel
Last year Mrs. Long received $160 in dividends on her shares of Company X stock, all of which she had held for the entire year. If she had had 12 more shares of the stock last year, she would have received $15 more in total annual dividends. How many shares of the stock did she have last year?

(A) 128
(B) 140
(C) 172
(D) 175
(E) 200

Breaking Down the Info:

$15 relative to $160 is \(\frac{15}{160} = \frac{3}{32}\) more. Then 12 more stocks is also \(\frac{3}{32}\) more stocks.

Thus there must be \(12 * \frac{32}{3} = 128\) stocks originally.


Answer: A

I quite liked this approach but I am having issue grasping the concept. I did get the correct answer by setting up the equations but can anyone elaborate on this with a little more detail?
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x/x+12 = 160/(160+15)
175x = 160(x+12)
175x = 160x + 1920
15x = 1920
x=128
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15/160=12/x

Solving for x, ans 128 shares.

Posted from my mobile device
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175/(s+12) = 160/s [equating profit per share]
s= 128 (upon cross multiplying and solving)
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15 dollars - 12 shares (as 12 extra shares are worth 15 dollars in dividends)

1 dollar - 12/15 shares

160 dollars - (12/15)*160 shares = 128 shares
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@BUNNEL, can you please help understand this sum ?
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yash2701
@BUNNEL, can you please help understand this sum ?
Last year Mrs. Long received $160 in dividends on her shares of Company X stock, all of which she had held for the entire year. If she had had 12 more shares of the stock last year, she would have received $15 more in total annual dividends. How many shares of the stock did she have last year?

(A) 128
(B) 140
(C) 172
(D) 175
(E) 200

12 more shares give $15 more, so 1 share gives 15/12 = 1.25.

She got $160 total, so 160/1.25 = 128 shares.

Answer: A.
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