Let number of $0.15 stamps = x
number of $0.29 stamps = y
statement 1
x(0.15) + y(0.29) = 4.40
two unknowns 1 eq - Not Suff.
statement 2
x = y------------------Insufficient
Together
Sufficient. imo C
I don't know how it is A
Please set this up
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rohangupta83
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jimmiejaz
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From 1, We have .15x+.29y=4.40
We may think that since we have 2 variables, we cant solve this equation, but if we plug values we will get the answer.
Since this equation contains a value of 0.29, and the total is 4.40, the stamps with value of 0.29 is a multiple of 5.
only x=10,y=10 fits the bill.
Hence suff.
From 2, we have x=y but still we dont know the total. hence insuff.
Hence A.
We may think that since we have 2 variables, we cant solve this equation, but if we plug values we will get the answer.
Since this equation contains a value of 0.29, and the total is 4.40, the stamps with value of 0.29 is a multiple of 5.
only x=10,y=10 fits the bill.
Hence suff.
From 2, we have x=y but still we dont know the total. hence insuff.
Hence A.
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rohangupta83
- Legendary Member
- Posts: 541
- Joined: Thu May 31, 2007 6:44 pm
- Location: UK
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Nice explanation..jimmiejaz wrote:From 1, We have .15x+.29y=4.40
We may think that since we have 2 variables, we cant solve this equation, but if we plug values we will get the answer.
Since this equation contains a value of 0.29, and the total is 4.40, the stamps with value of 0.29 is a multiple of 5.
only x=10,y=10 fits the bill.
Hence suff.
From 2, we have x=y but still we dont know the total. hence insuff.
Hence A.
