Q&A - P3 Math

[Full.010894Cream]

wangsoon:

My son has school homework which I was not able to do without resorting to algebra. Hope you can help.


(1) 3 similar apples and 3 similar pears cost $7.50
(2) 5 apples and 4 pears cost $11.
What is the cost of 1 apple.

Any ideas?

from (1), 12 apples and 12 pears = $7.50 x 4 = $30
from (2), 15 apples and 12 pears = $11 x 3 = $33
therefore, 3 apples = $3 or $1/apple

[Dharma]

wangsoon:

My son has school homework which I was not able to do without resorting to algebra. Hope you can help.


3 similar apples and 3 similar pears cost $7.50
5 apples and 4 pears cost $11.
What is the cost of 1 apple.

Any ideas?

Hope this is helpful

http://www.postimage.org/

[Merlion]

> I agreed with the other parents, guess and check.


I don’t think that this is a guess and check problem. At least, this will not be a good example for using guess and check method. It will be too time consuming to do that.

> Doesn’t "3 similar apples and 3 similar pears cost $7.50" means 6 fruits costing $7.50.

No. It means that the 3 apples are of the same kind (maybe red apple or green apple) and 3 pears are of the same kind (maybe Japanese pear or Australia pear) but apples are not the same as pears.

[watmekiasu]

Tk u Dharma and Merlion, I now understand. :oops:

[Suz855]

//Moderator's note: Topics merged.


Need help to answer the following geometry qn,

http://www.freeimagehosting.net/

How many pairs of parallel kines are there in the figure?

How many set of perpendicular lines are there.

Many thanks

Ps, all lines drawn in the figure are straight lines.

:idea:

[jedamum]

mods, please merge into http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=149&start=180.

TQ.

[Muffins]

ChiefKiasu:

Here's another one, this time from Catholic High Primary 3 SA1:


Gregory and Timothy has 192 stickers together. After Timothy gave 30 stickers to Gregory, Timothy had thrice as many sticker as Gregory. How many stickers did Gregory have at first?

Again... no algebra please.

This is how I would do it:

G : T
1 3

4u is 192

1u is 48

48 - 30 = 18

[bwpj2000]

//Moderator's note: Topics merged.


Need help with these questions from my son's P4 homework:

Q1. Edward has $40 more than Fariq. If Edward gives 1/5 of his money to Fariq, Fariq will have 7/8 as much money as Edward. How much money do they have altogether?

Q2. When Janice bought some files, the average cost was $4. After she bought one more file at $16, the average cost was $7. How many files did she buy at first?

Q3. Alex's monthly salary is $80 more than Bernard's monthly salary. Every month, they spend $950 each and save the rest of their money. After a few months, Alex saved $2805 while Bernard saved $1605.
(a) How many months did Alex take to save $2805?
(b) What is the total amount of money Alex and Bernard will earn in a month?

Responses are very much appreciated.

[jedamum]

mods,

pls merge.
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=149&start=0
TQ.

[tianzhu]

Hi

Q2 touches on averages.
Is averages covered in P4 Maths?