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gmatbull
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Carcas, can you please show how you applied the "ratio strategy"?
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Carcas, can you please show how you applied the "ratio strategy"?


because you have (make the things simple) FOR 3x + 7x = 100 so your UM is 7x (70 of bunuel): with 7x we have not real number but 1) provide us with.

IF 7x is the total number of students AND 40 not respond so 60 respond. IF you have 7x = 60 (real number) you CAN calculate the number of student (remember: we are talking of integers, so even you have 14.5 is not possible, is a constraint not written but you have to take in account for). However, it depens a lot from the context.

\(BE careful\): this is totally an inference and intuitive approach, that come up after several time of study and that you develope instinctively. Similar native speakers have about SC
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Carcass....you definitely have GMAT EAR.
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expand the tablet will lead fast and direct solution:

For only For both||| Against only Against both||| Not sure for only Not sure for neither|||

A 30-x x 40-y y 30-z z

B 40-x x 20-y y 40-z z

now it's very graphic:

the question is x=?

(1) not for either is 100-(30-x+x+40-x)=40

sufficient

(2) y=20

insufficient
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Hello from the GMAT Club BumpBot!

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