Q&A - P3 Math

[Herbie]

Oh! OK. Now i understand where the 2/11.

Sorry need to ask again where you get the 5/11 and 6/11?


Sorry very loh soh... :stupid:

[CoffeeCat]

It’s ok. After the first transfer of blue paint from B to A, there is 1.25-0.75=0.5 litres of blue paint still remaining in B. Since we now know that 4/11 & 2/11 are from A, the remaining 5/11 must be the blue paint still remaining whichcorresponds to 0.5 litres. The questions eventually ask for the amt of paint transferred from A to B, which corresponds to t he (4+2)/11 = 6/11 of mixture.

Is this your son’s homework?

[Herbie]

Hi CoffeeCat,


Nope! I found this qn from a book which I tot of showing it to my son on how to break down complex qn.
But I got stuck so need to understand how to resolve it before sharing the info with him. Cos my son has difficulty doing complex qn.. see the qn only he will get stuck and move on to the next qn. So I am trying to get him to overcome this problem.

Thanks very much for sharing how you solve the qn. Appreciate it!

[help]

Please help to solve this probe.


Ali has 3 times more than Sam. After Ali lost 18 marbles and Sam bought 12 marbles, they have equal number of marbles. How many marbles did have at first?

[CoffeeCat]

help:

Please help to solve this probe.


Ali has 3 times more than Sam. After Ali lost 18 marbles and Sam bought 12 marbles, they have equal number of marbles. How many marbles did have at first?

wahliew, i tried to post in that thread but you shifted here lol.
ok first you draw a model, 3 units for ali, 1 unit for sam. notice the 2 units difference between ali and sam is 18+12=32.
you make an account called help because you are looking for some help...lol:P

[Herbie]

3U -18= 1U+12

3U -1U = 18 +12
2U = 30
u =15

Total 4U= 15 x 4= 60

[tianzhu]

help:

Please help to solve this probe.


Ali has 3 times more than Sam. After Ali lost 18 marbles and Sam bought 12 marbles, they have equal number of marbles. How many marbles did have at first?

Ali has 3 times more than Sam.

Hi

Maybe, it should be read as
Ali has 3 times more marbles than Sam.

Take note of 3 times more as compared to 3 times as many as .....

One is 4 units to 1 unit whereas the other is 3 units to 1 unit

Best wishes

[CoffeeCat]

tianzhu:

help:

Please help to solve this probe.


Ali has 3 times more than Sam. After Ali lost 18 marbles and Sam bought 12 marbles, they have equal number of marbles. How many marbles did have at first?

Ali has 3 times more than Sam.

Hi

Maybe, it should be read as
Ali has 3 times more marbles than Sam.

Take note of 3 times more as compared to 3 times as many as .....

One is 4 units to 1 unit whereas the other is 3 units to 1 unit

Best wishes

This is a valid issue. I was confused by this when i was young, but from my observations of \"model answers\" in books, they treat \"3 times more than\" the same as \"3 times as many as\". Perhaps for this we really need some expert to clarify.

[P5G]

Herbie:

Thanks CoffeeCat,


I have another maths qn. Can help to solve it? Tx

Mr Tan had 1.5 litres of white paint on Tin A and 1.25litres of blue paint in Tin B. He poured 750ml of blue paint from TIn B into Tin A. He then poured some of the mixture in Tin A back into Tin B. if 7/11 of the final mixture in Tin B was made up of blue paint, what does the volume of mixture in Tin A that Mr Tan had poured into Tin B?

A -- 1500 ml White
B -- 1250 ml Blue

------------------------
1250 - 750 = 500 ml

A -- 1500 ml White + 750 ml Blue (mixture)
B -- 500 ml Blue

-----------------------
White -- 11/11 - 7/11 = 4/11 -- from A (mixture)
Blue -- 4/11 x 750/1500 = 2/11 -- from A (mixture)
7/11 - 2/11 = 5/11 -- Blue from B

5u -- 500 ml
1u -- 500/5 = 100 ml

6 u -- 100 x 6 = 600 ml paint from A (mixture)

[jesschan]

Hi! May I know is 2/1 considered to be an improper fraction?