There were 3 times as many apples as oranges.

After removing 106 apples and 14 oranges, there were 3 times as many oranges as apples left.

How many apples were there at first?

(Question from Bryan Chua)

## Saturday, March 31, 2012

## Friday, March 30, 2012

### P6 ratio (Heuristics: model and algebra )

Bobby had some red and blue marbles.

If 72 red marbles were removed, the ratio of the number red marbles to that of the blue marbles would be 1:2.

If 180 blue marbles were removed instead, the ratio would become 5:1.

How many red marbles were there?

(Adapted from a question from Bryan Chua)

If 72 red marbles were removed, the ratio of the number red marbles to that of the blue marbles would be 1:2.

If 180 blue marbles were removed instead, the ratio would become 5:1.

How many red marbles were there?

(Adapted from a question from Bryan Chua)

## Thursday, March 29, 2012

### P6 Fractions (Heuristics: draw a diag)

Four children Andy, Benny, Candy and Diane each had some savings.

Benny had 1/3 of the total amount Candy and Diane had.

Diane had 1/4 of the total amount Benny and Candy had.

Andy had 1/5 of the total amount Benny, Candy and Diane had.

Candy had $1067.

How much was the total savings of all the four children?

(Modified from Chloe Phang's question)

Benny had 1/3 of the total amount Candy and Diane had.

Diane had 1/4 of the total amount Benny and Candy had.

Andy had 1/5 of the total amount Benny, Candy and Diane had.

Candy had $1067.

How much was the total savings of all the four children?

(Modified from Chloe Phang's question)

### P6 Ratio (Heuristic: Guess-and-Check (GAC), Algebra, Area Diagram,)

Mrs Lim bought some forks and spoons in the ratio of 4:3.Each spoon cost 50 cents more than each fork.If she spent $156 altogether and the amount she spent on the forks was $12 more than the amount she spent on the spoons,how many forks and spoons did she buy?

(question from She Huiping dtd: Wed, Mar 28, 2012 at 5:58 PM)

(question from She Huiping dtd: Wed, Mar 28, 2012 at 5:58 PM)

## Sunday, March 25, 2012

## Friday, March 23, 2012

## Tuesday, March 20, 2012

## Sunday, March 18, 2012

### P6 average

Muthu bought some pens at an average price of $4.

After he returns a pen which cost $16, the average price became $2.

How many pens did he buy originally?

After he returns a pen which cost $16, the average price became $2.

How many pens did he buy originally?

Ans: email me ;)

## Tuesday, March 6, 2012

## Monday, March 5, 2012

### P5 / P6 Ratio, Fraction (Fr: Jayden

1) The ratio of the number of Donovan's stickers to the number of Hong Yi's stickers is 10:3. After Donavan gave Hong Yi 1/5 of his stickers, Hong Yi had 30 stickers less than Donavan. How many stickers did Donovan give to Hong Yi

2) Class A and Class B have the same number of pupils. The ratio of the number of boys in Class A to the number of boys in Class B is 3:2. The ratio of the number of girls in Class A to the number of girls in Class B is 3:5. Find the ratio of the number of boys in Class A to the number of girls in Class B.

___

Click here for my solution

2) Class A and Class B have the same number of pupils. The ratio of the number of boys in Class A to the number of boys in Class B is 3:2. The ratio of the number of girls in Class A to the number of girls in Class B is 3:5. Find the ratio of the number of boys in Class A to the number of girls in Class B.

___

Click here for my solution

## Sunday, March 4, 2012

## Saturday, March 3, 2012

### P5, P6 Percentage

Hi mr chang,

Can you help me solve this question?

My salary is 1/5 more than my sister but 20% less than my brother.

If our total salary is $11100, what is my sister's salary.

Thanks,

Jayden

Can you help me solve this question?

My salary is 1/5 more than my sister but 20% less than my brother.

If our total salary is $11100, what is my sister's salary.

Thanks,

Jayden

## Friday, March 2, 2012

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