Q&A - PSLE Math

[starfish53]

Can anyone help me with the following question?


Q1) 3/5 of Bette’s money is #324 more than 3/4 of 3/4 of Tina’s money.
Bette has twice as much as Tina.
a) How much does Tina have?
b) How much does Bette have?


Q2) Mary bought some red marbles and gave half to Noel.
Noel bought some blue marbles and gave half to Mary.
Mary lost 16 red marbles and Noel lost 55 blue marbles.
The ratio of Mary’s red marbles to blue marbles became 18 : 85 and
the ratio of Noel’s red marbles to blue marbles became 7 : 20.
How many red marbles marbles did Mar buy?

Thanks in advance.

[usaik]

Hello,


I need help on the following question. Can anyone please help. THANKS.

http://i42.tinypic.com/ap8z03.jpg\">

[MathIzzzFun]

usaik:

Hello,


I need help on the following question. Can anyone please help. THANKS.

http://i42.tinypic.com/ap8z03.jpg\">

similar questions discussed here:
There were 2 identical flights of steps. For the first of steps, Bobby walked up some steps and ran 9 steps in a total of 78 seconds. For the 2nd flight of steps, Bobby walked up some steps and ran 17 steps in a total of 48 seconds. How long will bobby take to walk up both flights of steps??
-- http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=27&t=6373&start=2790

There were 2 identical flights of steps.For the 1st flight of steps , Samuel walked up some steps and ran 7 steps in 67seconds. For the 2nd flight of steps, Samuel walked up some steps and ran 15 steps in 43seconds. How long will Samuel take to walk up both flight of steps?
--- http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=3750

Every Saturday, John will go for his usual exercise. if he runs up 32 steps and walks up 68 steps , he will take 184 seconds. If he runs up 50 steps and walks 50 steps, he will take 175 seconds. If he runs at the same rate throughout the whole exercise, how long will he take to run the 100 steps?
-- http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=9140

cheers.
--

[MathIzzzFun]

starfish53:

Can anyone help me with the following question?


Q2) Mary bought some red marbles and gave half to Noel.
Noel bought some blue marbles and gave half to Mary.
Mary lost 16 red marbles and Noel lost 55 blue marbles.
The ratio of Mary's red marbles to blue marbles became 18 : 85 and
the ratio of Noel's red marbles to blue marbles became 7 : 20.
How many red marbles marbles did Mar buy?

Thanks in advance.

this was discussed :
- http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=9190

- http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=9200

similar questions at:
- http://www.flickr.com/photos/mathizzzfun/6943541872/in/set-72157632928079102

- http://www.flickr.com/photos/mathizzzfun/8196644004/in/set-72157632037121311

cheers.

[MathIzzzFun]

starfish53:

Can anyone help me with the following question?


Q1) 3/5 of Bette's money is $324 more than 3/4 of Tina's money.
Bette has twice as much as Tina.
a) How much does Tina have?
b) How much does Bette have?

Thanks in advance.

Tina's money --> 4 units,

3/4 of Tina's money --> 3 units
3/5 of Bette's money -->3 units + $324 = 3 x (1 unit + $108)

Bette's money (5/5) --> 5 x (1 unit + $108) = 5 units + $540

Bette has twice as much as Tina
so,
5 units + $540 = 8 units
1 unit --> $180

Tina's money --> $ 720
Bette's money --> $ 1440

cheers.

[usaik]

Dear MathIzzzFun,


Thank you so much for your help!

Regards/

[ozora]

need help in the following question:

1) Tom’s present age is twice more than Sam’s age years ago. Today, Sam’s age is the same number of years ago. How old is Tom now if the sum of their present age is 30?

[MathIzzzFun]

ozora:

need help in the following question:

1) Tom's present age is twice more than Sam's age years ago. Today, Sam's age is the same number of years ago. How old is Tom now if the sum of their present age is 30?

any missing info ?
If the sentence is \"Today, Sam's age is the same as Tom's age same number of years ago\", then
Now, Sam's age --> 12 years, Tom's age --> 18 years
6 years ago, Sam's age --> 6 years, Tom's age --> 12 years.

cheers.

[david59]

starfish53:

Can anyone help me with the following question?


Q1) 3/5 of Bette's money is $324 more than 3/4 of Tina's money.
Bette has twice as much as Tina.
a) How much does Tina have?
b) How much does Bette have?


Thanks in advance.

For this kind of question, I like to use simultaneous equations because you just need to draw the model according to the logical understanding of the facts. This is useful especially for those who are good in interpreting the facts into models.

http://i42.tinypic.com/3169jeu.jpg\">

[ozora]

MathIzzzFun:

ozora:

need help in the following question:

1) Tom's present age is twice more than Sam's age years ago. Today, Sam's age is the same number of years ago. How old is Tom now if the sum of their present age is 30?

any missing info ?
If the sentence is \"Today, Sam's age is the same as Tom's age same number of years ago\", then
Now, Sam's age --> 12 years, Tom's age --> 18 years
6 years ago, Sam's age --> 6 years, Tom's age --> 12 years.

cheers.

yes there is missing infor.thanks for the highlight. sam's age is tom's age the same number of years ago.