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28 Jun 2016, 06:45
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D
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Difficulty:
85%
(hard)
Question Stats:
31% (02:33) correct
69%
(02:43)
wrong
based on 13
sessions
History
Date
Time
Result
Not Attempted Yet
A certain church bell rings the bell twice at half past the hour and four times at the hour plus an additional number of rings equal to what ever time it is. How many rings will the clock make from 6:20 in the morning to 10:10 in the morning?
A. 32.
B. 36.
C. 42.
D. 46.
E. 50.
A. 32.
B. 36.
C. 42.
D. 46.
E. 50.
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28 Jun 2016, 08:12
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Bunuel
# of half hours = 4
Rings for half hours = 4*2=8....(1)
# of full hours = 4
Rings for full hours = 4*4=16...(2)
Additional rings = 7+8+9+10=34...(3)
(1)+(2)+(3)=8+16+34=58
P.s. Where did I go wrong here?
Mo2men
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29 Jun 2016, 04:32
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AmoyV
Hi,
I believe you did not go wrong but the there is something in the wording of the question itself, albeit its good idea.
I agree with you on step 1 & 2. However, I understood the wording in the question as follows:
(four times at the hour plus an additional number of rings) require equal to what ever time it. My interpretation will be:
@ 7 o'clock, it will ring 4 (calculated in step 2) + 3 rings = 7 rings (to be equal the time what ever it is)
@ 8 o'clock, it will ring 4 (calculated in step 2) + 4 rings = 8 rings (to be equal the time what ever it is)
@ 9 o'clock, it will ring 4 (calculated in step 2) + 5 rings = 9 rings (to be equal the time what ever it is)
10 o'clock, it will ring 4 (calculated in step 2) + 6 rings = 10 rings (to be equal the time what ever it is)
Hence step 3:
3+4+5+6=18
Step 1, 2 & 3
8+16+18= 42
Answer: C. This is what I got according my understanding.
In some free resources, they do not consume time in high quality wording. Here is the source
https://www.hub4tech.com/certain-church- ... ll-twice-h
