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# If a stationery shop sells notebooks in A-4 size and A-5 size paper

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Math Expert
Joined: 02 Sep 2009
Posts: 50714
If a stationery shop sells notebooks in A-4 size and A-5 size paper  [#permalink]

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29 Oct 2018, 03:43
00:00

Difficulty:

5% (low)

Question Stats:

93% (00:49) correct 7% (00:00) wrong based on 30 sessions

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If a stationery shop sells notebooks in A-4 size and A-5 size paper, what is the price of a A-5 size notebooks?

(1) The total price of one A-4 size and one A-5 size notebooks is $4. (2) The total price of three A-4 size and one A-5 size notebooks is$9

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examPAL Representative
Joined: 07 Dec 2017
Posts: 806
Re: If a stationery shop sells notebooks in A-4 size and A-5 size paper  [#permalink]

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29 Oct 2018, 04:27
Bunuel wrote:
If a stationery shop sells notebooks in A-4 size and A-5 size paper, what is the price of a A-5 size notebooks?

(1) The total price of one A-4 size and one A-5 size notebooks is $4. (2) The total price of three A-4 size and one A-5 size notebooks is$9

We'll translate our statements into equations to make them easier to interpret.
This is a Precise approach.

(1) A4 + A5 = 4. This doesn't let us solve for A5.
Insufficient.

(2) 3A4 + A5 = 9. As abover, 1 equation with 2 variables - insufficient.
Insufficient.

Combined.
2 equations with 2 variables - sufficient!
_________________

(2) The total price of three A-4 size and one A-5 size notebooks is $9 1. x+y=4. Insufficient. 2. 3x+y=9. Insufficient. Together, it can be easily solved for x and y. C. Too easy to be true, Am I missing something? Director Joined: 19 Oct 2013 Posts: 502 Location: Kuwait GPA: 3.2 WE: Engineering (Real Estate) Re: If a stationery shop sells notebooks in A-4 size and A-5 size paper [#permalink] ### Show Tags 29 Oct 2018, 15:45 Md231 I initially felt the same, but I don’t think you’re missing out on anything. The question seems to be straightforward. Posted from my mobile device Intern Joined: 08 Jul 2017 Posts: 35 Re: If a stationery shop sells notebooks in A-4 size and A-5 size paper [#permalink] ### Show Tags 01 Nov 2018, 23:02 If a stationery shop sells notebooks in A-4 size and A-5 size paper, what is the price of a A-5 size notebooks? (1) The total price of one A-4 size and one A-5 size notebooks is$4.
(2) The total price of three A-4 size and one A-5 size notebooks is \$9

Statement 1 and 2 each give an equation each in the two prices. Hence, each alone is insufficient. However, on combining, as the two equations are exclusive, they can be combined to get unique values of each price. No need to solve to save time.

C.
Re: If a stationery shop sells notebooks in A-4 size and A-5 size paper &nbs [#permalink] 01 Nov 2018, 23:02
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