Tutor MathsGuru: Ask me for your burning Maths questions!

[Guan Hui]

1.

since one orange cost 2 times a pineapple
12 orange==> 24 pineapples
24+4=28pineapples
4 units=>28pineapples
1unit=> 28/4=7 pineapples
He can buy 7 pineapples with the rest of the money.

2.
1 highlighter cost 3 times a marker
highlighter $0.90 ===> marker $0.30

Bert spent 2/5 of his money on markers and 1/3 of the remainder on a pen(i do not know why suddenly got a pen>.<so> highlighter=$0.90
2 units===> $0.90x2=$1.80
$1.80/ $0.30=6 markers
Bert bought 6 markers.

[chanpy]

Muffins:

Hi chanpy, the correct answer is 9 bags. As there are 4 cupcakes in each bag, 4X8=32 only, not 34, so the next number of bags would be 9! :shock: :yikes:

Thanks for the reply. Told my gal to check again with the teacher and the answer is still 8 bags :? Guess just have to leave it..

[CoffeeCat]

chanpy:

Muffins:

Hi chanpy, the correct answer is 9 bags. As there are 4 cupcakes in each bag, 4X8=32 only, not 34, so the next number of bags would be 9! :shock: :yikes:

Thanks for the reply. Told my gal to check again with the teacher and the answer is still 8 bags :? Guess just have to leave it..

maybe need to clarify the working instead of just the answer?

[Guan Hui]

I am also quite sure the answer is 9… unless they throw away the last 2…

its like if you got 5 flowers and each vase can only contain 4 flowers… you will need 2 vase not 1…

[sachiko]

Guan Hui:

1.

since one orange cost 2 times a pineapple
12 orange==> 24 pineapples
24+4=28pineapples
4 units=>28pineapples
1unit=> 28/4=7 pineapples
He can buy 7 pineapples with the rest of the money.

2.
1 highlighter cost 3 times a marker
highlighter $0.90 ===> marker $0.30

Bert spent 2/5 of his money on markers and 1/3 of the remainder on a pen(i do not know why suddenly got a pen>.<so> highlighter=$0.90
2 units===> $0.90x2=$1.80
$1.80/ $0.30=6 markers
Bert bought 6 markers.

Thank you Guan Hui

I understand how to derive the answer for qn 1 now. However, for qn 2, can you please enlighten me why did you use :

2 units===> $0.90x2=$1.80

I still dun get it.

[Guan Hui]

After spending 2/5 of his money on markers, he left with 3/5 of his money left. He then spend 1/3 of the remainder on a highlighter.

So..
1/3 * 3/5= 1/5
so he actually spend 1/5 of his money on the highlighter.
Since we know he spend $0.90 on highlighter, we know the amount he spend on markers is $0.90 x 2=$1.80

Does this clear the question?

[sachiko]

Guan Hui:

After spending 2/5 of his money on markers, he left with 3/5 of his money left. He then spend 1/3 of the remainder on a highlighter.

So..
1/3 * 3/5= 1/5
so he actually spend 1/5 of his money on the highlighter.
Since we know he spend $0.90 on highlighter, we know the amount he spend on markers is $0.90 x 2=$1.80

Does this clear the question?

Yes, it is very clear. Thanks so much.

[pandan]

Hi,


I am not able to open the solutions provided by mathsguru and the other parents. Is it something wrong with my pc ? Please help me.

Thank you.

[pandan]

Hi again,


I desperately needed those model solutions provided by all the helpful parents. I am having a really hard time helping my girl with her maths paper. Please help me !!

When I click on the picture, it shows a cross. If I save it as "save picture as" I am not able to see it clearly at all. I only encounter this problem today.

Would appreciate your help. Thank you.

[Vanilla Cake]

starlight1968sg:

1) Andy, Betty, Candy and Danny each have some money. The amount of money Andy has is 1/3 of the total amount of money Betty, Candy and Danny have. The amount of money Betty has is 1/4 of the total amount of money Andy, Candy and Danny have. The amount of money Candy has is 1/5 of the total amount of money Andy, Betty and Danny have. If Danny has $1725, how much do they have altogether?

This is Q17 [5 marks] from http://www.orlesson.org/orp/09Ma/2009-Math-SA1-MahaBodhi.pdf set on 5 May 2009.

starlight1968sg:

2) Tom and Jerry each has some money. If Tom spends $90 per day and Jerry spends $45 per day, Tom will have $1100 left when Jerry has spent all his money. If Tom spends $45 each day and Jerry spends $90 each day, Tom will have $1700 left when Jerry has spent all his money. How much did Jerry have?

This is Q16 [5 marks] from http://www.orlesson.org/orp/09Ma/2009-Math-SA1-MahaBodhi.pdf set on 5 May 2009.
This is similar to a 4-mark question from http://www.wendykoh.com/08/primary6-acssa2-maths.pdf set on 20 Aug 2008.