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What was the number of roses produced by a certain rosebush

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VP
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What was the number of roses produced by a certain rosebush [#permalink] New post 30 Jul 2004, 07:17
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C
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E

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What was the number of roses produced by a certain rosebush during 1981?

(1) For each rose it produced during 1980, the rosebush produced 1.4 roses during 1981.

(2) In 1981 the rosebush produced exactly 10 more roses than it
produced the previous year.

Please explain, thank you.
VP
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 [#permalink] New post 30 Jul 2004, 08:15
excuse me, could you give me the reason?

thank you
Senior Manager
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 [#permalink] New post 31 Jul 2004, 04:16
Here's why it is C:

Let 1980 be X and 1981 be Y.

1) Y=1.4X

2) Y = 10 + X

You need both equations to get an answer.
VP
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 [#permalink] New post 31 Jul 2004, 06:29
Sorry, I don't understand what the first choice means?

Why could you list the equation: y=1.4X

Do you mean that each of the roses produced in 1980 produces 1.4 roses in 1981?


could anyone explain more? thank you
Senior Manager
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 [#permalink] New post 31 Jul 2004, 06:37
Well.. yes. That's what the questions says.
That the bush produces 1.4 times more roses.
Director
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 [#permalink] New post 31 Jul 2004, 11:17
Chunjuwu,
Dookie is right. let me try explaining..

I will try to sync with Dookie, to avoid any confusion, but will try to be elaborate. Here is the approach.

Let Y be the rose produce in 1980. Let X be the the roses in 1981. We have

(1)Y= 1.4X. Since we have two variables and one equation, we need one more equation relating to Y and X to solve. Hence 1 by itself is insufficient.

(2) X=Y+10. Again this question stem has two variables and one equation. So (2) by itself if insufficient.

combining both (1) and (2) we have two equations and two variables and we can find X and Y for sure. We can solve, but pls dont solve (as per the practice in approaching DS problems).

Hence C is the best answer.
VP
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Location: Taiwan
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 [#permalink] New post 01 Aug 2004, 05:57
thank you very much, venksune.

You're really a nice guy.
  [#permalink] 01 Aug 2004, 05:57
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What was the number of roses produced by a certain rosebush

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