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# Problem Solving

Sun 12 Apr, 2009 09:12 pm
I own a cafe'. The 1st day I opened no one come in. The 2nd day 5 people came in; the 3rd day 10 people came in and the 4th day 15 people. Also people left their business card for a free lunch. On the 1st day 0; the second day 3 people left their card; and each following day, 3 more people left business cards than the previous day. If this pattern continues what is the difference between the total number of customers and the total number of business cards after a full year (365 days)?
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Type: Question • Score: 0 • Views: 2,849 • Replies: 7
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solipsister

1
Mon 13 Apr, 2009 01:02 am
@birdie148,
dunno
solipsister

1
Mon 13 Apr, 2009 01:28 am
@solipsister,
approximately 280260?
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Joe4398384838

0
Tue 23 Aug, 2022 08:20 am
The table below shows the number of people who voted for each candidate in the recent school
election:

Alison 84, Harold 100, Kevin 72, Peter 126, and Rachel 63.

When drawing a pie chart of the results one of the numbers above was not read correctly (the other
four were correct). The angles were calculated as 113.4 degrees, 90 degrees, 75.6 degrees, 56.7
degrees, and 24.3 degrees.
Whose score was copied incorrectly when the pie chart was constructed?

the answer is Kevin. i need explanation pls
engineer

1
Tue 23 Aug, 2022 10:43 am
@birdie148,
The difference is two per day so the formula for the difference is 2*(n-1) where n is the number of days. After 365 days, the difference is 728.
0 Replies

engineer

2
Tue 23 Aug, 2022 10:55 am
@Joe4398384838,
If the total number of votes is N, the angle of the pie chart would be 360*v/N where v is the number of votes a candidate got. If you use this formula for all five candidates, three of them come up with N=400 for the total number of votes. Both Rachel and Kevin look wrong because by putting them in order, Rachel looks like she matches with 24.3 degrees and Kevin with 56.7 degrees. Since we know the total number of votes was 400, we can see that Rachel should match up with 56.7 degrees, so the one that is off is Kevin. A 24.3 degree angle implies 27 votes, not the 72 Kevin actually got.
Joe4398384838

-1
Sun 28 Aug, 2022 10:01 am
@engineer,

can u look at Q50 and provide an explanation pls?
engineer

1
Mon 29 Aug, 2022 12:39 pm
@Joe4398384838,
Quote:
I am a member of a book club. Every month I must choose at least one book. All books are sold at a discount of £2.00 on shop prices. I pay a fixed charge for postage regardless of which books I order. Which one of the following graphs could show the relationship between the number of books ordered in a month and the total saving on shop prices (allowing for postage charge)?

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