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Source: — Data Sufficiency |
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by cramya » Mon Jan 12, 2009 5:18 pm
Let cost of buying 6 chairs in sets = Cs
Let cost of buying 1 chairs individually = Ci
Let cost of buying 6 chairs individually = 6Ci


Given Cs < 6Ci

TO FIND : Cs

Stmt I

Cs = .90* (6*Ci)

INSUFF
We just know the relation BETWEEN Cs & Ci.Dont know the exact costs.

Stmt II
Cs + 20 = 5Ci


INSUFF
We just know the relation.Dont know the exact costs

Stmt I and II together

SUFFICIENT

Cs = .90* (6*Ci) (1)

Cs + 20 = 5Ci (2)

SUBSTITUTE Cs = .90* (6*Ci) IN (2)

We can solve for Ci and then Cs. No need to calculate since its a DataSufficiency question

Choose C)

Hope this helps! Let me know if u still hv questions.
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by japan1453 » Tue Jan 13, 2009 12:57 pm
Thanks cramya. But I had calculated the equations and not found a solution and then selected E. "No need to calculate is the key for me"
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by welcome » Tue Jan 13, 2009 3:23 pm
Good solution Cramya. One small correction.

Stmt II
Cs + 20 = 5Ci should be

Stmt II
Cs = 20 + 5Ci

Though not affecting answer.

Ans is still C .
Shubham.
590 >> 630 >> 640 >> 610 >> 600 >> 640 >> 590 >> 640 >> 590 >> 590
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