Q&A - P3 Math

[WS1234567]

Dharma:

Devnahouse:

Hello,

Can help me solve this one.

The cost of 7 erasers and 3 rulers is $5.05.
The cost of 2 erasers and 6 rulers is $3.95
Find the cost of 2 erasers and 2 rules.

Many thanks.

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

I think when the person designed this question, he or she failed to take into account if the student had tried a different approach to this question. Using a different approach, the cost of an eraser is $0.5125 and the cost of a rler would be $1.025.
When I set Math exam papers for my school, I make it a point to make the figures realistic. The unit cost of items must have at most 2 decimal places.

However, the solution provided was very creative. Thumbs up.

[Augmum]

WS1234567:

Dharma:

[quote=\"Devnahouse\"]Hello,

Can help me solve this one.

The cost of 7 erasers and 3 rulers is $5.05.
The cost of 2 erasers and 6 rulers is $3.95
Find the cost of 2 erasers and 2 rules.

Many thanks.

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

I think when the person designed this question, he or she failed to take into account if the student had tried a different approach to this question. Using a different approach, the cost of an eraser is $0.5125 and the cost of a rler would be $1.025.When I set Math exam papers for my school, I make it a point to make the figures realistic. The unit cost of items must have at most 2 decimal places.

However, the solution provided was very creative. Thumbs up. :D[/quote]just happen to click on this thread as it appears on the front page

yes, if using algebraic approach, will get a 4 decimal figure, the answer of
1 eraser = $0.5125 and
1 ruler = $2.925/ 6 = $0.4875
think WS1234567 keyed in the wrong figure for the cost of ruler

[peterch]

Augmum:

WS1234567:

[quote=\"Dharma\"]
http://www.postimage.org/image.php?v=TsKNGfA

I think when the person designed this question, he or she failed to take into account if the student had tried a different approach to this question. Using a different approach, the cost of an eraser is $0.5125 and the cost of a rler would be $1.025.When I set Math exam papers for my school, I make it a point to make the figures realistic. The unit cost of items must have at most 2 decimal places.

However, the solution provided was very creative. Thumbs up.

just happen to click on this thread as it appears on the front page

yes, if using algebraic approach, will get a 4 decimal figure, the answer of
1 eraser = $0.5125 and
1 ruler = $2.925/ 6 = $0.4875
think WS1234567 keyed in the wrong figure for the cost of ruler[/quote]So 2 eraser + 2 Ruler would be (0.5125 x 2) + (0.4875 x 2) = $ 2

[Augmum]

peterch:

Augmum:

yes, if using algebraic approach, will get a 4 decimal figure, the answer of
1 eraser = $0.5125 and
1 ruler = $2.925/ 6 = $0.4875
think WS1234567 keyed in the wrong figure for the cost of ruler

So 2 eraser + 2 Ruler would be (0.5125 x 2) + (0.4875 x 2) = $ 2

ya.........non-realistic figures for the cost of 1 eraser or 1 ruler
unless the teacher who sets this Question thinks that
all buyers have to buy 2 erasers and 2 rulers together.......
(dun think she work out other methods of approach)

[bookwormkids]

Hi! This is a P3 question:


I am a 3-digit number. My hundreds and tens digit are the same. My ones digit is 4 more than my tens digit. What number can I be?

Ans given: 559

Seems like more than one answer to me! :? My boy's answer seems correct and logic to me: 448

Any kind soul able to advise? :?:

[femi]

hi need help, i does not know how to do this 2 question. hope u can help me to solve the questions thanks :lol:


question 1)Aminah and Shanthinee had 128 bookmarks altogether.Aminah gave 1/4of her bookmarks to geraldine. Shanthinee have the same number of bookmarks left. How many bookmarks had shanthinee have at first?

question 2)Mrs Raja gave 17 boys and girls a total of 105 clips. Each boy was given 5 clips and each girl was given 7 clips.If all the girls were to give all their clips to the boys, how many more clips would each boy get?


thanks for helping :celebrate: :?: :? :lol: :shock: :roll: :love: :!: :?:

[Muffins]

hi bookwormkids, this has a multitude of answers. Maybe the book just picked one of those. Examples of answers would be: 115, 226, 337, 448, 559

[shurley197323]

A Kettle has 420ml more water than a jug. When 150ml of water is poured from the jug into the kettle,there are 4 times as much water in the kettle as the jug. How much water is there in the jug now ?

[femi]

femi:

hi need help, i does not know how to do this 2 question. hope u can help me to solve the questions thanks :lol:


question 1)Aminah and Shanthinee had 128 bookmarks altogether.Aminah gave 1/4of her bookmarks to geraldine. Shanthinee have the same number of bookmarks left. How many bookmarks had shanthinee have at first?

question 2)Mrs Raja gave 17 boys and girls a total of 105 clips. Each boy was given 5 clips and each girl was given 7 clips.If all the girls were to give all their clips to the boys, how many more clips would each boy get?


thanks for helping :celebrate: :?: :? :lol: :shock: :roll: :love: :!: :?:

[femi]

femi:

hi need help, i does not know how to do this 2 question. hope u can help me to solve the questions thanks :lol:


question 1)Aminah and Shanthinee had 128 bookmarks altogether.Aminah gave 1/4of her bookmarks to geraldine. Shanthinee have the same number of bookmarks left. How many bookmarks had shanthinee have at first?

question 2)Mrs Raja gave 17 boys and girls a total of 105 clips. Each boy was given 5 clips and each girl was given 7 clips.If all the girls were to give all their clips to the boys, how many more clips would each boy get?


thanks for helping :celebrate: :?: :? :lol: :shock: :roll: :love: :!: :?: