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12 May 2010, 18:49
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Q:Robert purchased $2000 worth of US saving bonds. If bonds are sold in $50 or $100 denominations only, which of the following CANNOT be the number of US saving bonds that Robert purchased?
A:20
B:27
C:30
D:40
E:50
Please explain the problem and also why other answer choices are incorrect?
Thanks in advance.
A:20
B:27
C:30
D:40
E:50
OA: E
Please explain the problem and also why other answer choices are incorrect?
Thanks in advance.
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12 May 2010, 18:53
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I started off with looking at the answer choices... 20-27-30 are in a tight range, so my guess was to look and rule out the bigger numbers.
The total amount is $2000. So with 50 bonds, each $50 = $2500 , we already exceed the $2000 limit. Hence E is the answer.
40bonds could be correct too but it works out to $2000 right away so it is also ruled out.
E remains.
The total amount is $2000. So with 50 bonds, each $50 = $2500 , we already exceed the $2000 limit. Hence E is the answer.
40bonds could be correct too but it works out to $2000 right away so it is also ruled out.
E remains.
12 May 2010, 22:15
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The question is basically asking if you have $2000 in some combination of $50s and $100s, how many bills (bonds) are there? Or in this case, which is not a possibility.
Glancing over the options, I knew 50 bills was too high to work. The maximum number of bonds has to be 40 (all $50s), so E has to be the answer. Don't worry about why the others are incorrect.
In questions like this, I usually try to narrow down the choices by determining the range of answers. In this case, the number of bills would have to range from 20 (all $100) to 40. Anything outside that range would not work in the formula.
Glancing over the options, I knew 50 bills was too high to work. The maximum number of bonds has to be 40 (all $50s), so E has to be the answer. Don't worry about why the others are incorrect.
In questions like this, I usually try to narrow down the choices by determining the range of answers. In this case, the number of bills would have to range from 20 (all $100) to 40. Anything outside that range would not work in the formula.
