Daddy:

\" Harry and Frank have 480 cards altogether. After Harry gve 90 cards to Frank, Frank has twice as many cards as Harry. How many cards do the two boys have at first.\"

Hi this is a question using 2-step method and model drawing.
Draw the \"after\" position first and you will be able to see it clearly.

http://www.postimage.org/

So each unit represents 160 (=480/3)
Harry has 160 after giving 90 to Frank, so Harry has 250 (=160+90) at first
Frank has 230 (=480-250) or (160*2=320; 320-90)

Daddy:

Can you show me in model form. Thanks..

Hope this helps.

http://www.postimage.org/image.php?v=TsfYHC0

Daddy:

Hi,

\"30 children attended a party. Each girl ate 3 chickens wings and each boy ate 4 chicken wings. The boys ate 36 more chicken wings than girls. How many boys attended the party?\"

http://www.postimage.org/

mamona:

Many Many Thanks for your reply. Yes I understood the method. :lol:

You are welcome!

mamona:

Sakina has 15 coins. There are 20c coins and 50c coins. The total amount is $4.80. How many 20c coins are there?

Perhaps you could explain the following method for P3 :
The first step is to assume that all the coins are either 50c coins or 20c coins.
Assuming all 15 coins are 20c coins, total value is only $3
Find the difference compared to $4.80; i.e. $1.80.
(easier to do show this in a table - see below)

2nd step
Since the total is less than $4.80, there should be more 50c coins and fewer 20c coins ( i.e. need more of those with higher value)
Conversely if the total is more than $4.80, there should be fewer 50c coins and more 20c coins. (This scenario is not possible for we had assumed that all are 20c coins).

3rd step
The 3rd step cuts down the number of iterations required for the 'guess and check' method.

For every 50c coin you increase, you have to decrease the 20c coin as well.
As such, the value increased per coin is only 30c (50c-20c)
As above, assuming all are 20c coins, total value is only $3, we are short of $1.80.
$1.80 / 30c = 6
i.e. increase 6 50c coins and decrease 6 20c coins
As such, the number of 20c coins is 15-6=9

4th step
Complete in table to check
http://www.postimage.org/

Jolyn:

I have a Question for P2 which need help on the explaination on the answer as below:

Jolyn, these actually appear to be more of P3 standard rather than P2?

Jolyn:

Q3
The mass of Box A is equal to the total mass of Box B and Box C. The mass of Box A is 22 kg. Box B is 2 kg heavier than Box C. What is the toal mass of Box A and Box C?

http://www.postimage.org/

Jolyn:

Q2
In a factory there are 24 male workers. If there are twice as many male workers than female workers. How many works are there altogether?

http://www.postimage.org/

Jolyn:

Q1
Cavan had a bag of sweets. He gave half of the sweets to Janis, then gave half of the remaining sweets to Sue. Cavan had 8 sweets left. How many sweets did Cavan have at first?

http://www.postimage.org/