Welcome to Test-paper.info
Friday, October 20 2017 @ 12:38 PM CDT
 Select a Forum » General Chat » Primary 1 Matters » Primary 2 Matters » Primary 3 Matters » Primary 4 Matters » Primary 5 Matters » Primary 6 Matters » Question, Feedback and Comments » Education Classified
 Forum Index >  Test Paper Related >  Primary 4 Matters P4 Maths
 First | Previous | 1 2 | Next | Last | Printable Version
 By: pearldyn (offline)  Tuesday, March 02 2010 @ 09:44 AM CST (Read 12730 times)
pearldyn

Here's another problematic question that always causes me headache.

3 similar oven toasters and 4 similar kettles cost \$120.
2 such oven toasters and 1 such kettle cost \$95.
Find the cost of an oven toaster.

If possible show me the model drawing as well.

Junior

Registered: 06/17/09
Posts: 30

 By: Jocelynliew (offline)  Tuesday, March 02 2010 @ 07:25 PM CST
Jocelynliew

I have the same problems as you. I have 2 sons. One is in Pri 6 and the another in Pri 4. Everytime they ask me about the problem sums, I don't seem to understand. I find it too difficult. I will ask them to ask their daddy, but their daddy knows how to do but don't know how to explain to them. My son who is in Pri 6 don't like to draw model for the problem sums.

Newbie

Registered: 11/03/09
Posts: 1

 By: AVE (offline)  Tuesday, March 09 2010 @ 03:04 AM CST
AVE

hi here it is:

let x = the cost of each oven toaster
let y = the cost of each kettle

equation1: 3(x) + 4(y) = 120

equation2: 2(x) + y = 95

multiply equation 2 by 4: 4 times (2(x) + y = 95) and get equation 3:

equation3: 8(x) + 4(y) = 380

subtract equation 1 from equation 3:

8x + 4y = 380
- 3x + 4y = 120
-----------------------------
5x + 0 = 260

you get 5x = 260
x = 260/5
x= 52

Newbie

Registered: 03/08/10
Posts: 5

 By: AVE (offline)  Tuesday, March 09 2010 @ 03:07 AM CST
AVE

you can email me if you need personal tutor: ellaav@yahoo.com

thanks.

Newbie

Registered: 03/08/10
Posts: 5

 By: Charisse (offline)  Wednesday, May 05 2010 @ 11:17 AM CDT
Charisse

Quote by: AVE

hi here it is:

let x = the cost of each oven toaster
let y = the cost of each kettle

equation1: 3(x) + 4(y) = 120

equation2: 2(x) + y = 95

multiply equation 2 by 4: 4 times (2(x) + y = 95) and get equation 3:

equation3: 8(x) + 4(y) = 380

subtract equation 1 from equation 3:

8x + 4y = 380
- 3x + 4y = 120
-----------------------------
5x + 0 = 260

you get 5x = 260
x = 260/5
x= 52

..if toaster's 52, what's the kettle? -9?

Newbie

Registered: 05/05/10
Posts: 3

 By: pklua (offline)  Wednesday, May 05 2010 @ 09:17 PM CDT
pklua

T= Oven Toaster
K=Kettle

3T + 4 K = \$120----(1)
2T + 1 K = \$95------(2)

Add the 2 equations together, you get 5T + 5K = \$215
Hence, 1T + 1K = \$43 ----(3)

(2) -(3),
1 T = \$52

Even though the question does not sound logical, this is usually the way this type of questions are being solved.

Newbie

Registered: 12/31/06
Posts: 2

 By: Charisse (offline)  Thursday, May 06 2010 @ 10:11 AM CDT
Charisse

Quote by: pklua

T= Oven Toaster
K=Kettle

3T + 4 K = \$120----(1)
2T + 1 K = \$95------(2)

Add the 2 equations together, you get 5T + 5K = \$215
Hence, 1T + 1K = \$43 ----(3)

(2) -(3),
1 T = \$52

Even though the question does not sound logical, this is usually the way this type of questions are being solved.

sure hope you are not one of those who put together our schools' exam papers.

how can maths b... illogical? it doesn't matter how the questions' usually solved. the answer's not logical. try explaining to the kid, who probably try to put the toaster's cost back into the statement to find the cost of the kettle. and wala! its a negative!! how cool is that??

Newbie

Registered: 05/05/10
Posts: 3

 By: Charisse (offline)  Thursday, May 06 2010 @ 10:15 AM CDT
Charisse

oh btw, this problem came out in a P4 SA1 exam paper. they haven't learnt simultaneous equation

Newbie

Registered: 05/05/10
Posts: 3

 By: CHEEKEE (offline)  Tuesday, May 11 2010 @ 03:23 AM CDT
CHEEKEE

[b] FOR ME ALSO I ALWAYS DON'T KNOW HOW TO DO THIS KIND OF QUESTION!!!! [/b]

Newbie

Registered: 05/10/10
Posts: 1

 By: nisalam (offline)  Monday, May 17 2010 @ 08:15 AM CDT
nisalam

pklua is right. instead of using K and T, just draw out the kettles and toasters for your p4 kid. Once they see the 5 kettles and toasters, everything will fall in place. You avoid using simultaneous equations that way. This is called pre-algebra under the p4 maths syllabus.

Junior

Registered: 04/29/10
Posts: 30

 First | Previous | 1 2 | Next | Last

 All times are CDT. The time is now 12:38 pm.
 Normal Topic Locked Topic Sticky Topic
 New Post Sticky Topic w/ New Post Locked Topic w/ New Post
 View Anonymous Posts Able to Post HTML Allowed Censored Content