One night a certain motel rented 3/4 of its rooms, including 2/3 of its air conditioned rooms. If 3/5 of its rooms were air conditioned, what percent of the rooms that were not rented were air conditioned?
a. 20%
b. 33 1/3%
c. 35%
d. 40%
e. 80%
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Say total number of rooms = 400
No. of rooms rented = 3/4 * 400 = 300 (not rented = 100)
No. of rooms with AC = 3/5 * 400 = 240
No. of rooms rented with AC = 2/3 * 240 = 160
No. of rooms Not rented with AC = 240 -160 = 80
Percent of rooms not rented with AC = 80/100 = 80%
Answer is E
No. of rooms rented = 3/4 * 400 = 300 (not rented = 100)
No. of rooms with AC = 3/5 * 400 = 240
No. of rooms rented with AC = 2/3 * 240 = 160
No. of rooms Not rented with AC = 240 -160 = 80
Percent of rooms not rented with AC = 80/100 = 80%
Answer is E
Say there were 60 rooms. The we can arrive at the following table using given data.
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| Rented | Not Rented |Total
---------------------------------------
AC | 24 | 12 | 36
---------------------------------------
No AC | 21 | 3 | 24
---------------------------------------
Total| 45 | 15 | 60
----------------------------------------
From table above, % of non rented ac rooms = 12/15 * 100 = 80%
IMO E
---------------------------------------
| Rented | Not Rented |Total
---------------------------------------
AC | 24 | 12 | 36
---------------------------------------
No AC | 21 | 3 | 24
---------------------------------------
Total| 45 | 15 | 60
----------------------------------------
From table above, % of non rented ac rooms = 12/15 * 100 = 80%
IMO E
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Call X total rooms => rented rooms = 3X/4 => not rented rooms = X/4
Then, we have AC rooms: 3X/5 => rented rooms with AC: (2/3)*(3X/5) = 2X/5
Thus, we have not rented rooms with AC: 3X/5 - 2X/5 = X/5
As a result, (X/5)/(X/4) = 0.8 = 80%
Answer: E
Hope it's useful
Then, we have AC rooms: 3X/5 => rented rooms with AC: (2/3)*(3X/5) = 2X/5
Thus, we have not rented rooms with AC: 3X/5 - 2X/5 = X/5
As a result, (X/5)/(X/4) = 0.8 = 80%
Answer: E
Hope it's useful
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total rooms = n
rented=3n/4
air conditioned rooms=x=3n/5
ac rooms rented = 2x/3=2n/5
ac rooms not rented = n/5
total non-rented rooms = n/4
thus% = 80
IMO E
rented=3n/4
air conditioned rooms=x=3n/5
ac rooms rented = 2x/3=2n/5
ac rooms not rented = n/5
total non-rented rooms = n/4
thus% = 80
IMO E
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Sum was easy but we got to try the GMAT language - what percent of the rooms that were not rented were air conditioned?
that is what is confusing....
that is what is confusing....
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LEARNING, APPLICATION AND TIMING IS THE FACT OF GMAT AND LIFE AS WELL... KEEP PLAYING!!!
Whenever you feel that my post really helped you to learn something new, please press on the 'THANK' button.