Q&A - P5 Math

[blueymum]

Dear all…


Need some help with the following question.

When a tin of paint is 1/2 full, it weighs 5kg.
When it is 1/3 full, it weighs 4kg. What is the weight of tin when it is full?


Thank you!!

[MathIzzzFun]

blueymum:

Dear all..


Need some help with the following question.

When a tin of paint is 1/2 full, it weighs 5kg.
When it is 1/3 full, it weighs 4kg. What is the weight of tin when it is full?


Thank you!!

Hi

Total 6 units of paint when full ( common multiple of 2 & 3)
[Empty Tin][3 units of paint] = 5kg
[Empty Tin][2 units of paint] = 4 kg
1 unit of paint = 5 - 4 = 1kg
So, total mass of the tin when full = 5 kg + 3 units of paint = 5 kg + 3 kg = 8 kg

cheers.

[blueymum]

Thanks so much.


Would it be possible to use model to solve? The teacher has asked the students to solve using the model approach.

Thanks once again.

[MathIzzzFun]

blueymum:

Thanks so much.


Would it be possible to use model to solve? The teacher has asked the students to solve using the model approach.

Thanks once again.

Hi

yes.. as per the solution..

empty tin = big block
paint = 6 smaller blocks

First model - big block + 3 smaller blocks with 3 dotted blocks = 5 kg
2nd model - big block + 2 smaller blocks with 4 dotted blocks = 4 kg

cheers.

[Winx5015]

Hello,


Need help for the following questions.

Q1). In a basket, the ratio of the number of apples to the number of oranges to the number of pears is 2:6:7. Express the number of oranges as a fraction of the total number apples and pears in the basket.(Write the fraction in its simplest form)

Q2). Jim has some 50-cent and 20-cent coins. He has less than 65 50-cent coins and more 50-cents coins than 20-cent coins. The total value of the 50-cent coins and 20-cent coins that he has is $43.20. What is the least possible number of 50-cent coins that he has?

Thanks!

[corneyAmber]

Winx5015:

Hello,


Need help for the following questions.

Q1). In a basket, the ratio of the number of apples to the number of oranges to the number of pears is 2:6:7. Express the number of oranges as a fraction of the total number apples and pears in the basket.(Write the fraction in its simplest form)

Q2). Jim has some 50-cent and 20-cent coins. He has less than 65 50-cent coins and more 50-cents coins than 20-cent coins. The total value of the 50-cent coins and 20-cent coins that he has is $43.20. What is the least possible number of 50-cent coins that he has?

Thanks!

Q1: Fraction of apples+ pears = (2+7)/15 = 9/15
Fraction of oranges = 6/15
Oranges / apples+pears = (6/15) / (9/15) = 6/9 = 2/3

Q2: Guess and check:
$0.50______$0.20
64_______56
60_______66
62_______61

So least possible number of $0.50 is 62

[Muffins]

Winx5015:

Hello,


Need help for the following questions.

Q1). In a basket, the ratio of the number of apples to the number of oranges to the number of pears is 2:6:7. Express the number of oranges as a fraction of the total number apples and pears in the basket.(Write the fraction in its simplest form)

Q2). Jim has some 50-cent and 20-cent coins. He has less than 65 50-cent coins and more 50-cents coins than 20-cent coins. The total value of the 50-cent coins and 20-cent coins that he has is $43.20. What is the least possible number of 50-cent coins that he has?

Thanks!

Hi.

In your Question 1, your question is a little ambiguous. If you want it as a fraction of only the apples and pears, then the answer would be 6/13. If you want it as a fraction of all 3, then the answer is 2/5.

[Winx5015]

Hi ksi,


Thanks for solving my problems.

:thankyou:

[euniceloke]

Willy and Peter have $256. Willy spent 0.5 of his money on a shirt while Peter spent 0.4 of his money on a bag. The bag cost $8 more then the shirt. How much money did Willy have at first

[YumYum]

Hi, need help with the foll Qns:


Henry Park 2010, paper 2, Qn 12.

(Apologies, I am having some problem in uploading the picture)

Thanks