Bond Maths Multiple Choice test 4 Q 12 - is it right?
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Bond Maths Multiple Choice test 4 Q 12 - is it right?
A computer checks emails and news updates on a regular basis. In the 24-hour period the computer checks emails every 5 minutes and news updates every 7 minutes. Neither work when both checks are being done at the same time and this causes an error message on the screen. There is 1 error message after an hour and three error messages after 2 hours. How many error messages are there after 24 hours?
Answer: 41
Thanks in advance. I am puzzled. I thought it was supposed to be 48?
Answer: 41
Thanks in advance. I am puzzled. I thought it was supposed to be 48?
Dear Irene
We know errors arrive every 35 minutes, need to know how many 35s are in 24 hours.
24 hours converted into minutes = 24 x 60 = 1440 [or 24 x 6 add a nought]
1440 divided by 35
To make it simple without the help of a calculator or if the child cannot divide large numbers. We can break it down, as we know...
10 x 35 =350
20 x 35 is 700
40 x 35 = 1400
1400 to 1440 would produce 1 more 35, therefore answer is 41.
Patricia
We know errors arrive every 35 minutes, need to know how many 35s are in 24 hours.
24 hours converted into minutes = 24 x 60 = 1440 [or 24 x 6 add a nought]
1440 divided by 35
To make it simple without the help of a calculator or if the child cannot divide large numbers. We can break it down, as we know...
10 x 35 =350
20 x 35 is 700
40 x 35 = 1400
1400 to 1440 would produce 1 more 35, therefore answer is 41.
Patricia
As already indicated above, lowest common multiple question. 7x5 = 35, to give you the error message frequency. The 1 error after 1hr etc. information is actually superfluous in this example, and you can get the correct answer by default. But in practice gives you an envelope in which the first error occurs, so that you know the start point, and which can affect how many whole error periods fit into 24hrs.irene wrote:Thanks.
I understand the first bit but why 24x12 ? and then divided by 7? And what do we do with the information 1 error after 1 hour and 3 errors after 2 hours?
Sorry for being slow.
And does anyone think that that's too complicated and can't be in the tests?
Thanks to all.
Irene,
I don't think it is supposed to be something that is "taught" in schools. This looks like a good question for the 11+ to me as it requires some innate mathematical reasoning ability. In my view, the questions that require a lot of "teaching" in order for any child to be able to answer them are not tests of ability, but tests of how well the child has been taught a particular syllabus in school or by a tutor.
When I read through NFER maths practise questions I would not be surprised by a question like the one you have quoted, but by ones that require specific mathematical "knowledge".
I don't know whether your 11+ would contain this type of question or not. Are you in an NFER area or not? If you are, read through the nfer practise papers and see if this type of question is in there or not.
I don't think it is supposed to be something that is "taught" in schools. This looks like a good question for the 11+ to me as it requires some innate mathematical reasoning ability. In my view, the questions that require a lot of "teaching" in order for any child to be able to answer them are not tests of ability, but tests of how well the child has been taught a particular syllabus in school or by a tutor.
When I read through NFER maths practise questions I would not be surprised by a question like the one you have quoted, but by ones that require specific mathematical "knowledge".
I don't know whether your 11+ would contain this type of question or not. Are you in an NFER area or not? If you are, read through the nfer practise papers and see if this type of question is in there or not.
Lowest common multiple is 12. By which time they would, between them have painted 5 houses. Therefore 10 houses would take 24 hrs.irene wrote:Is it 50 hours (6+4)/2x10?John paints ahouse in 4 hrs and Jim paints a house in 6 hrs.
How long does it take both working together to paint 10 houses?
Could not explain very well the computer&updates Q to my D.
Just hope she'll figure something out.
Thanks.
Cannot be 50 hrs if you think about it, because john could paint more than 10 houses on his own.