Q&A - P3 Math

[blessedami]

shurley197323:

Pls help. MRS CHENG USED 4/5KG OF 2KG OF SUGAR TO MIX WITH SOME FLOUR. THE AMOUNT OF FLOUR SHE USED IS 1/10KG LESS THAN THE AMOUNT OF SUGAR. WHAT WAS THE MASS OF THE MIXTURE.?

Hi

Do you mean 4/5 of 2kg of sugar?? :?

If so, then 4/5 of 2kg would be 4/5 of 2000g which is 1600g

Then, since he used 100g (1/10 kg is 100g) less flour, he used 1500g of flour.

So, the total would be 1600g + 1500g = 3100g = 3kg 100g

Not really sure though....

[shurley197323]

Yes.Thanks blessedami. The answer is the same. 3kg100g

[SPI]

I need help on this. Thanks in advance.


3 shirts cost as much as 5 blouse. Mrs Tan bought 2 such shirts and 4 blouses for $110. find the cost of 6 such shirts

[tianzhu]

SPI:

3 shirts cost as much as 5 blouse. Mrs Tan bought 2 such shirts and 4 blouses for $110. find the cost of 6 such shirts

Hi

A common multiple of 3 and 5 is 15.

Shirt ----- 5 units
Blouse ------ 3 units

(2*5) + (4*3) ------ 22 units
22 units ----- 110
1 unit ----- 5

1 shirt ------ $25
6 shirts ----- $150

Best wishes

[meiah]

removed.

[SPI]

:? Why my question 3 shirt became 5 units? Typo error or ? My teacher said can use faction to solve this problem. Can teach me?

tianzhu:

SPI:

3 shirts cost as much as 5 blouse. Mrs Tan bought 2 such shirts and 4 blouses for $110. find the cost of 6 such shirts

Hi

A common multiple of 3 and 5 is 15.

Shirt ----- 5 units
Blouse ------ 3 units

(2*5) + (4*3) ------ 22 units
22 units ----- 110
1 unit ----- 5

1 shirt ------ $25
6 shirts ----- $150

Best wishes

:?

[tianzhu]

SPI:

Why my question 3 shirt became 5 units?

Hi

You may use MD to solve this question.

The bars representing the cost of the 3 shirts and 5 blouses should be of the same size.

Divide first bar into 3 parts to represent 3 shirts,
Divide the second bar into 5 parts to represent 5 blouses.

To compare we need to make the number of units the same. A common multiple 3 and 5 is 15.

Hence shirt ------ 5 units (1/3)
Blouse ------ 3 units (1/5)

Or if you prefer to work using simultaneous concepts, similar to “stars and moons’ type of questions

3S ------ 5B
6S ------ 10B

2S + 4B ------ 110
Multiply by 3 to give
6S + 12B ------ 330

10B + 12B ----- 330
22B ----- 330
1B ------15

10B -----150
Hence, 6S -------150

You may also choose to work by pictorial method instead of alphabet method.

Best wishes

[SPI]

ok thanks Tianzhu.

[MathIzzzFun]

SPI:

I need help on this. Thanks in advance.


3 shirts cost as much as 5 blouse. Mrs Tan bought 2 such shirts and 4 blouses for $110. find the cost of 6 such shirts

hi

hope this will help.


http://postimage.org/image/1f0olc8mc/

cheers.

[tianzhu]

SPI:

ok thanks Tianzhu.

Hi

You're welcome.

Best wishes