Tutor MathsGuru: Ask me for your burning Maths questions!

[mathsguru]

firebird:

Dear mathsguru


Please help me on this maths, which i have forgot to post earlier:

1) Tracy counted the number of 10cents coins, 20 cents coins ans 50 cents coins in her piggy bank. The number of 10cents coins was 24 more than the number of 50 cents coins. After spending 3/5 of the 10cents coins, 1/4 of the 20 cents coins and 18 50cents coins, she had equal number of 10cents coins and 20 cents coins. The number of 50 cents coins now formed 40% of the remaining number of coins.

a) How many 10 cents coins did tracy have at first? Given ans 90
b) How much did she spend in all? given ans $16.80

Many thanks
firebird

Hi Firebird,

Here's my solution.

Cheers,
MathsGuru

http://www.postimage.org/image.php?v=gx7NJor

[mathsguru]

YLH88:

Hi Mathsguru, Vanilla Cake,


OIC... Thank you! Now I understand

Sorry, 1 more question below need your expertise advise. :?
This question is from St Nich SA1 Paper 2 Qn 12 :

The figure below is made up of 2 squares and a rectangle. The ratio of the area of A to the area of B to the area of C is 9 : 4 :3.
The ratio of the unshaded part of B to the unshaded part of C is 4 : 1.
If the shaded part is 56 m sq, find the area of A that is not covered by B.
(ans is 105 cm sq)

http://www.postimage.org/image.php?v=aVxniQS

Thank you very much!

Hi YLH88,

You're most welcome. Glad you understand it!

Here's the solution!


MathsGuru

http://www.postimage.org/image.php?v=PqLImQJ

[starlight1968sg]

Hi,

I need some help again.

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?

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?

I am totally clueless on how to start?

MTIA.

[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?

The amount of money Andy has is 1/3 of the total amount of money Betty, Candy and Danny means total $ in terms of ratio is 1+3=4.

The amount of money Betty has is 1/4 of the total amount of money Andy, Candy and Danny have means total $ in terms of ratio is 1+4=5.
The amount of money Candy has is 1/5 of the total amount of money Andy, Betty and Danny have means total $ in terms of ratio is 1+5=6.

LCM for 4,5,6 is 60.

A : B+C+D
1 : 3
15:45

B : A+C+D
1 : 4
12 : 48

C : A+B+D
1 : 5
10 : 50

D->(60-15-12-10) units=23 units

23 units = $1725
60 units = $4500
Total amount of money that they have altogether is $4500

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?

Pls refer to this similar question from ACS(J)/ACS(P)2008 P6 Prelim Q41.Here's the http://prischoolmaths.blogspot.com/2009/06/maths-whole-number_7545.html. You should be able to figure it out and solve accordingly.
Hope the above clues are enough for you to start solving them while waiting for Mathsguru's solutions.

[firebird]

Dear mathsguru


Good evening.

Thank you very much for your answers. All of them are very clear.

With best regards
firebird

[ChiefKiasu]

mathsguru, just as a small token of our appreciation for the help you have rendered to our community, we award you 5000 KPs for you kind contributions!

[corneyAmber]

ChiefKiasu:

mathsguru, just as a small token of our appreciation for the help you have rendered to our community, we award you 5000 KPs for you kind contributions!

That is very nice indeed.. *clap clap clap*

[YLH88]

Hi Mathsguru, Coffeecat,


Thank you very much for the solution!!

[quote]ChiefKiasu wrote:
mathsguru, just as a small token of our appreciation for the help you have rendered to our community, we award you 5000 KPs for you kind contributions! [/quote]Congratulations, Mathsguru!!

[starlight1968sg]

Thanks Vanilla Cake for your help.

[Tiramisu Coco]

Hi mathsguru,


Need your help to solve this problem sum:

Roger had $186 more than Belinda. When he gave $20 to Belinda he still had three times as much money as she. How much did Roger have at first?

Thanks.