1234ROXY
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#1
Report Thread starter 3 months ago
#1
Could someone help me with the below maths question?
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Aleksander Krol
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#2
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#2
umm.. there's no question below... :/
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1234ROXY
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#3
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#3
Here it is
My four children are called Fiona, Ben, George and Darwin. Their birthdays are on the 15th,35th,144th and 323rd days of the year respectively. Which two of my children have their birthday on the same day of the week?

A Fiona and Darwin
B Ben and George
C George and Darwin
D Darwin and Ben
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mqb2766
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#4
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#4
(Original post by Aleksander Krol)
w...
Best to get the OP to post some working first, as per the guidelines.
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1234ROXY
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#5
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#5
I thought George and Darwin is the answer but not correct.
323-144 = 179 is not a multiple of 7.
Leap year or a non-leap year none of the options will always work.
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mqb2766
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#6
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#6
(Original post by 1234ROXY)
I thought George and Darwin is the answer but not correct.
323-144 = 179 is not a multiple of 7.
Leap year or a non-leap year none of the options will always work.
What about the other combinations?
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1234ROXY
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#7
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#7
Other combinations for
* Fiona and Darwin= 35-15= 20
* Ben and George = 144-35 = 109
* Darwin and Ben = 323-35 = 288
I do not know where to go from here.
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1234ROXY
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#8
Report Thread starter 3 months ago
#8
No worries I know how to work out the answer now.
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mqb2766
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#9
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#9
(Original post by 1234ROXY)
No worries I know how to work out the answer now.
Sure, you made a typo mistake with the numbers. Arguably the neatest way to do it is to note the remainder for each person when divided by 7 and check which pair have the same remainder as this corresponds to the same day of the week, leap year or not. The correct answer corresponds to them both having remainder 1.

From a quick google, it looks like a bmat question and the forum guidelines ask people to post some form of attempt, when they post the question. Assuming it is bmat, you should be post gcse, so it should have been possible to make some form of attempt. Your reply in #5 is pretty much identical to the original response to your identical post on Jiskha
https://www.jiskha.com/questions/188...ben-george-and
Last edited by mqb2766; 3 months ago
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HollyLeafUK
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#10
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#10
"twenty-two"
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