El
A B
BCE
ONLY NOW do you combine the statements. If Alejandro bought more than three
stamps and spent less than $2, do you know how many stamps he bought? Well, “more
than three stamps” means the same as “at least four stamps.” If he bought four stamps,
he spent $1.60. If he bought five stamps, he would’ve spent exactly $2.00. But you know
he spent less than $2.00. So he must have bought exactly four stamps. SUFFICIENT.
The answer is (C). There’s no need to check (E); you’re done!
Backup Approaches for Quant Problems
-Jon Schneider
Knowing the textbook solution for a GMAT problem feels great. But on
an adaptive test, you’re unlikely to know the textbook solution for every prob
lem that you see. Many test-takers panic when they can’t find the “best” solution to a
problem. They fear making a random guess, so they spend too long searching for the
textbook solution, even though they’re not sure how to set it up or execute it. But for
many problems there is a lot of room between the textbook solution and a random
guess. Having a practiced and consistent set of backup approaches will allow you to
switch from the hunt for the right answer to the hunt for a good guess before resort
ing to a random guess. This will not only improve your GMAT score, it will also boost
your confidence. After all, having a practiced arsenal of backup approaches gives you a
safety net, a line of defense between the “right” approach and a total guess.
O f course, this requires that you (1) know the backup approaches applicable to the
common problem types, and (2) have a practiced method of using these backup ap
proaches, so that they can be used quickly and properly.
This worksheet is designed to help you learn the basic backup approaches, and gives
you suggestions for how to practice those approaches. Remember that not all backup
approaches fully “solve” GMAT problems; more often, a backup approach will just
help you to make some process of elimination, so that you have a better chance when
guessing. Finally, not all GMAT problems have a decent backup approach, so don’t get
stuck searching for one. In general, follow the “1—2—3 Approach”: try the textbook so
lution first, but when you are stuck (or staring for 10+ seconds), switch to a backup ap
proach; if you find yourself staring for 10+ seconds while trying the backup approach,
make a random guess. Successful implementation of this strategy will allow you fewer
random guesses, but it will also make those random guesses happen faster. After all, if
we’re really stumped on a problem, the best thing to do is move on.
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