Q&A - P3 Math

[htan045]

Dear Tianzhu and all


Greatly appreciate input to the following P4 math questions:-

(1) Malek and Wahab had 525 marbles. 1/6 of Malek’s marbles and 4/11 of Wahab’s marbles were blue in colour. The rest were red in colour. If they had equal number of blue marbles, how many red marbles did Wahab have?

(2) Mr Chen celebrates his birthday today. 12 years ago, he was thrice as old as his daughter, and his wife was 24 years older than her daughter. If his wife is 51 years old this year, how old was Mr Chen last year? Is the answer 57 or 56 years old?

Thanks.

[tianzhu]

Hi


A quick answer.

For Q1
1/6 ------ 4/11
There are equal number of blue marbles, hence make the numerators of the fractions the same.

4/24 ------ 4/11

35 units ------ 525
1 unit ------ 15

7 units ------ 105 (Wahab’s share of red marbles)

For Q2, the answer is 56 years old.

Best wishes

[htan045]

Thank you for your prompt reply.

[mama_10]

A pen cost $1 and a eraser cost $0.2,John paid $20 for some eraser and pen. 5/8 items he bought were eraser, how many eraser he bouhght?


thks!

[vmom]

Hi All,

Need help with a P3 Question with the help of model diagram

There are a total of 232 balls.
There are 12 more red balls than blue balls.
There are twice as many green balls as red balls.
How many green balls are there?

[corneyAmber]

vmom:

Hi All,

Need help with a P3 Question with the help of model diagram

There are a total of 232 balls.
There are 12 more red balls than blue balls.
There are twice as many green balls as red balls.
How many green balls are there?

This is a solution from my dd:

G___12___12
R___12
B___
where___=u

12x 3= 36
4u -> 232-36
u -> 196/4 = 49

Green balls = 49x2 + 12x2 = 98+24= 122

[tianzhu]

mama_10:

A pen cost $1 and a eraser cost $0.2,John paid $20 for some eraser and pen. 5/8 items he bought were eraser, how many eraser he bouhght?


thks!

Hi

A quick answer.

Using “Number* Value” Method.

Pens ------ 3 units
Erasers ------ 5 units

Pens ------ 3*100 ------ 300 units
Erasers ------ 5*20 ------ 100 units

400 units ------- 2000 ($20 ------ 2000 cents)

1 unit ------- 5
\t
Erasers -------5*5 ------- 25

Best wishes

[tianzhu]

htan045:

Thank you for your prompt reply.

Hi

You're welcome.

Best wishes

[vmom]

Hi ksi

Thx for ur prompt reply

[yxl]

1) Regina and Audrey went on a tour together. Regina bought 3 times as much money as Audrey. After Regina had spent $540 and Audrey spent $60, they had equal amount of money left. How much money had each of them left?