Tutor MathsGuru: Ask me for your burning Maths questions!
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I need help for this Question:
1. Mr Gunalan has 640 books. 3/4 of them are storybooks and the remaining books are magazines and journals. 3/5 of the remaining books are magazines.
a) How many magazines does he have?
b) He wants to buy more magazines so that the number of magazines he has will increase to 20% of the total number of books. How many more magazines must he buy?
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Below is my son’s answer.
640x ¾ = 480 (story books)
640-480=160(magazine+journal)
160 x 3/5 = 96(magazines)
b) 480+64=544 (story books and journals)
Since magazines will take up 20%, story books and journals will take up 80%.
544 –> 80%
20% –> 136
136 is the number of magazines after purchase.
136-96=40(magazines to be bought) -
pls help me with this problem
1) Container A contains 250 red marbles and 200 blue marbles. Container B contains 600 red marbles and 150 blue marbles.How many red and blue marbles must be moved from Container A to Container B such that 25% of the marbles in Container A are red and 75% of the marbles in container B are red.
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http://www.postimage.org/image.php?v=TsA0t7J
The figure is madeup of two identical rightangled triangles,a small square & a big square.the perimeter of the shaded region is 50cm,& the total area of the two square is 254.5sqcm.
find the total area of the two shaded right-angled triangle.
Pls help me with the problem. -
super star:
1) Container A contains 250 red marbles and 200 blue marbles. Container B contains 600 red marbles and 150 blue marbles.How many red and blue marbles must be moved from Container A to Container B such that 25% of the marbles in Container A are red and 75% of the marbles in container B are red.
This question is from RGPS 2009 P6 SA1 Paper 2 Q18 and pls refer to http://psle2010a.blogspot.com/2010/04/percentage-p6-2009-sa1-p2-rgs-q18_5512.html.
VC's mum -
super star:
This question is from RGPS 2009 P6 SA1 Paper 2 Q14 and pls refer to http://psle2010a.blogspot.com/2010/04/area-p6-2009-sa1-p2-rgs-q14_4890.html.http://www.postimage.org/image.php?v=TsA0t7J
The figure is madeup of two identical rightangled triangles,a small square & a big square.the perimeter of the shaded region is 50cm,& the total area of the two square is 254.5sqcm.
find the total area of the two shaded right-angled triangle.
VC's mum -
super star:
Red : 250 + 600 = 850pls help me with this problem
1) Container A contains 250 red marbles and 200 blue marbles. Container B contains 600 red marbles and 150 blue marbles.How many red and blue marbles must be moved from Container A to Container B such that 25% of the marbles in Container A are red and 75% of the marbles in container B are red.
Blue : 200 + 150 = 350
25%A + 75%B = 850 ------------- (1)
75%A + 25%B = 350 -------------(2)
100%A + 100%B = 1200 ------------(1) + (2)
100%A + 300%B = 3400 -------------(1) X 4
200%B = 3400 – 1200 = 2200
100%B = 1100
100%A = 100
No. of red and blue marbles transferred from Container A to B
= (250 + 200) – 100 = 350 -
THANK YOU :lol:
Dharma:
Red : 250 + 600 = 850super star:
pls help me with this problem
1) Container A contains 250 red marbles and 200 blue marbles. Container B contains 600 red marbles and 150 blue marbles.How many red and blue marbles must be moved from Container A to Container B such that 25% of the marbles in Container A are red and 75% of the marbles in container B are red.
Blue : 200 + 150 = 350
25%A + 75%B = 850 ------------- (1)
75%A + 25%B = 350 -------------(2)
100%A + 100%B = 1200 ------------(1) + (2)
100%A + 300%B = 3400 -------------(1) X 4
200%B = 3400 – 1200 = 2200
100%B = 1100
100%A = 100
No. of red and blue marbles transferred from Container A to B
= (250 + 200) – 100 = 350 -
Thank you
Vanilla Cake:
This question is from RGPS 2009 P6 SA1 Paper 2 Q14 and pls refer to http://psle2010a.blogspot.com/2010/04/area-p6-2009-sa1-p2-rgs-q14_4890.html.super star:
http://www.postimage.org/image.php?v=TsA0t7J
The figure is madeup of two identical rightangled triangles,a small square & a big square.the perimeter of the shaded region is 50cm,& the total area of the two square is 254.5sqcm.
find the total area of the two shaded right-angled triangle.
VC's mum -
super star:
[/quote]Very sad that P6's are made to do such question. The strategy tested is good but the use of an area of 254.5 cm2 is bad. Should have just use a whole number.Thank you
This question is from RGPS 2009 P6 SA1 Paper 2 Q14 and pls refer to http://psle2010a.blogspot.com/2010/04/area-p6-2009-sa1-p2-rgs-q14_4890.html. Vanilla Cake:
[quote=\"super star\"]http://www.postimage.org/image.php?v=TsA0t7J
The figure is madeup of two identical rightangled triangles,a small square & a big square.the perimeter of the shaded region is 50cm,& the total area of the two square is 254.5sqcm.
find the total area of the two shaded right-angled triangle.
VC's mum -
Hi all,
Here is a Before & After question that I come across on one assessment…
Yesterday, Peter has 689 Singapore and Malaysia stamps. This morning, he used 2/5 of his Singapore stamps to exchange for 31 Malaysia stamps. As a result, he now has equal number of Singapore and Malaysia stamps. How many Malaysia does he has yesterday?
Can someone used Model and algebra to solve this question.
Appreciate with Thanks.
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