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29 Oct 2018, 04:43
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C
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Difficulty:
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Question Stats:
100% (00:51) correct
0%
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wrong
based on 32
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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
(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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29 Oct 2018, 05:27
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Bunuel
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!
(C) is our answer.
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29 Oct 2018, 05:31
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From statement 1:
\(P_{A4} + P_{A5} = 4$\).
Two unknowns and one equation.
Insufficient.
From statement 2:
\(3P_{A4} + P_{A5} = 9$\).
Again, Two unknowns and one equation.
Insufficient.
Combining both.
Subtracting equation of S1 from S2.
\(2P_{A4} = 5\)
or \(P_{A4} = 2.5$\)
Then \(P_{A5} = 1.5$\)
Sufficient.
C is the answer.
\(P_{A4} + P_{A5} = 4$\).
Two unknowns and one equation.
Insufficient.
From statement 2:
\(3P_{A4} + P_{A5} = 9$\).
Again, Two unknowns and one equation.
Insufficient.
Combining both.
Subtracting equation of S1 from S2.
\(2P_{A4} = 5\)
or \(P_{A4} = 2.5$\)
Then \(P_{A5} = 1.5$\)
Sufficient.
C is the answer.
