Aptitude - Average - Discussion

Discussion Forum : Average - General Questions (Q.No. 13)
13.
A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:
250
276
280
285
Answer: Option
Explanation:

Since the month begins with a Sunday, to there will be five Sundays in the month.

Required average
= 510 x 5 + 240 x 25
30
= 8550
30
= 285

Discussion:
29 comments Page 2 of 3.

Teja said:   1 decade ago
@Julie.

In a month we have to find how many Sundays. So for that in a week now that we have 6 days except Sunday.

i.e; 30/6 = 5.
5 means total Sundays in a month.
Then total 30 days 30-5 = 25.
25 is remaining days. So simple.

Kamesh said:   1 decade ago
30 Day's so,
30/7 = 28 + 2 day's so, 4 week's +2 days.
S m t w th f sat
S m t w th f sat
S m t w th f sat
S m t w th f sat
S m
5 sunday's
25 other day's

5*510 = 2550
25*240 = 6000

(6000+2550)/30= 285.

Prasad said:   1 decade ago
Hi Julie,

In a 30 days month you will get 5 sundays if the 1st day is sunday.

So 5 sundays x 510 = 2550

Remaining 25 days X 240 days =6000.

So 2550 +6000= 8550/30 = 285.

Phanikiran said:   1 decade ago
If month begins with any other day. Then how it will be?

Then 4 Sundays and 26 remaining days for a month right?

So then the count will be 510*4 + 26*240. Is this true?

Chandra said:   10 years ago
In this question it is not clear that first day of month is Sunday so how could we assume that there is five Sunday in this month.

Please enlighten me.

Engr.Muhammad Ahmed said:   9 years ago
Well done! All people are doing a good job by giving clear explanation. This is a good thing to understand the solution in different ways.

Sam Giftson said:   4 years ago
They asked for avg visitors per day in a month but we found the avg visitors for the whole month. I'm confused. Please anyone clear this.

Naina said:   7 years ago
@All. Not all months with 30 days have 5 Sundays.

What if there are 4 Sundays in a month of 30 days, then the answer will be 276.
(2)

Sheeeba said:   8 years ago
Hey, everyone! what if the month has 31 days? There is a possibility of that as well! right?

Can someone please explain?
(1)

Srinivasa reddy said:   9 years ago
Why should we have to think the month start with Sunday?

If it starts with Thursday then we are only 2 Sundays?


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