Tutor MathsGuru: Ask me for your burning Maths questions!

[Vanilla Cake]

corvette:

Dear Gurus,

For the Maha Bodi 2010 Prelim question 18 (the speed question), how is the answer of 40 min derived?

I am not any guru but just a year 2 student. Quick one while waiting for answers from KSP members. Pls refer to Uncle Observer's http://psle2010a.blogspot.com/ which he had kindly worked out the solutions for most of the 2010 P6 Prelim Maths questions from top schools.

Solution for Maha Bodhi 2010 P6 Prelim Q18 by http://psle2010a.blogspot.com/2010/09/maha-modhi-p6-speed-q18.html.
Solution for Maha Bodhi 2010 P6 Prelim Q18 by http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=280&postdays=0&postorder=asc&start=1700 dated 09 Sep 2010 11:26
Solution for Maha Bodhi 2010 P6 Prelim Q18 by http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=280&postdays=0&postorder=asc&start=1710 dated 09 Sep 2010 14:52

corvette:

Rosyth 2010 question 16:-
Machine A and B each printed a fixed number of newspapers per hour.
Machine B started printing earlier at a rate of 75 copies per hour. After Machine B had printed for 10 hours, Machine A had printed 340 copies. After Machine B had printed for 16 hours, Machine A had printed 886 copies.
a) How many copies of newspapers did Machine A print per hour?
b) How long would MAchine B hsve worked when both machines have printed a total of 2 750 copies?
Given answer is a) 92 copies per hour
b) 20 hours

Can any help how answer b is derived? Thank you for enlightening me.

Solution by http://psle2010a.blogspot.com/2010/09/rates-p6-2010-sa2-rosyth-p2-q16.html for Rosyth School 2010 P6 Prelim paper 2 Q16

[maggieloh]

From Red Swastika Prelim 2010 MCQ Question worth 2 marks


In a group of 36 students, the number of students who like sushi is thrice the number of students who like nuggets. If 2 students like neither sushi nor nuggets and 6 students like both, how many students like nuggets ?
(1) 13
(2) 10
(3) 3
(4) 7

[corvette]

Also need with question attached. Rosyth 2010 prelims Qn 15.

Thank you.
ABCD is a square with side 12 cm. AFC and BFE are straight lines. Given that AE = ED, find the shaded of CDEF.
http://www.postimage.org/image.php?v=aVCGgL0

[corneyAmber]

maggieloh:

From Red Swastika Prelim 2010 MCQ Question worth 2 marks


In a group of 36 students, the number of students who like sushi is thrice the number of students who like nuggets. If 2 students like neither sushi nor nuggets and 6 students like both, how many students like nuggets ?
(1) 13
(2) 10
(3) 3
(4) 7

Answer is (2) 10

Check the working here: http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=280&start=1730

[Vanilla Cake]

corvette:

Also need with question attached. Rosyth 2010 prelims Qn 15.

Thank you
http://www.postimage.org/image.php?v=aVCGgL0

There is missing info in your diagram. Pls refer to the http://2.bp.blogspot.com/_EG8oMs7TIYA/TIns3AWWjTI/AAAAAAAAAR0/x-6klcSbE-8/s1600/MathsP610AreaRosythA15.jpg in Uncle Observer's blog.

[maggieloh]

ksi:

maggieloh:

From Red Swastika Prelim 2010 MCQ Question worth 2 marks


Answer is (2) 10

Check the working here: http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=280&start=1730

Thanks :lol:

[corvette]

Vanilla Cake:

corvette:

Also need with question attached. Rosyth 2010 prelims Qn 15.

Thank you
http://www.postimage.org/image.php?v=aVCGgL0

There is missing info in your diagram. Pls refer to the http://2.bp.blogspot.com/_EG8oMs7TIYA/TIns3AWWjTI/AAAAAAAAAR0/x-6klcSbE-8/s1600/MathsP610AreaRosythA15.jpg in Uncle Observer's blog.

Sorry have put in missing info but where can Isee Uncle Observer's solution?

[Vanilla Cake]

corvette:

Vanilla Cake:

[quote=\"corvette\"]Also need with question attached. Rosyth 2010 prelims Qn 15.

Thank you
http://www.postimage.org/image.php?v=aVCGgL0

There is missing info in your diagram. Pls refer to the http://2.bp.blogspot.com/_EG8oMs7TIYA/TIns3AWWjTI/AAAAAAAAAR0/x-6klcSbE-8/s1600/MathsP610AreaRosythA15.jpg in Uncle Observer's blog.

Sorry have put in missing info but where can Isee Uncle Observer's solution?[/quote]http://psle2010a.blogspot.com/2010/09/area-p6-2010-sa2-rosyth-p2-q15.html for Rosyth P6 Prelim 2010 Paper 2 Q15. Pls visit his http://psle2010a.blogspot.com/ for solutions for most of the questions from P6 Prelim 2010 - top schools.

[benorito]

This is from Red Swastika Prelim 2010 Q 8:


Raju and Gywneth shared some sweets. If Raju gave 1/2 of his share to Gywneth, Gywneth will have 8 more sweets from Raju. If Raju gave 1/4 of his share to Gywneth, Gywneth would have 2 more sweets than Raju. How many sweets did Raju have at first ?

The given answer was 12. Is this correct ?

[kancheongmum]

benorito:

This is from Red Swastika Prelim 2010 Q 8:


Raju and Gywneth shared some sweets. If Raju gave 1/2 of his share to Gywneth, Gywneth will have 8 more sweets from Raju. If Raju gave 1/4 of his share to Gywneth, Gywneth would have 2 more sweets than Raju. How many sweets did Raju have at first ?

The given answer was 12. Is this correct ?

Hi this is how my ds solve the problem as he is not good with model:

get the common denominator for both fraction 1/2 --- 2/4
Raju has a total of 4u at first
this is internal transfer so total for both cases are equal

1st case --- Raju gave Gywneth 2u --- total --- 2u + 2u +8 = 4u +8
2nd case ---Raju gave Gywneth 1u --- total --- 3u + 3u +2 = 6u +2

4u + 8 = 6u + 2
2u --- 6
1u --- 3

4u --- 3 x 4 = 12 sweets