Q&A - P5 Math

[MathIzzzFun]

tayobus:

There were twice as many red marbles as yellow marbles in a box.

When 2 red marbles were put into the box and 6 yellow marble were taken out, there was 3 times as many red marbles than yellow marble in the box.
What was the total number of marbles at 1st?
:?: :imdrowning: :thankyou:

note: I am assuming that the underlined text should read as \"there was 3 times as red marbles as yellow marble in the box.\", as the original sentence structure doesn't seem proper.

In the end,
Blue --> 1 unit
Red --> 3 units

At first,
Blue --> 1 unit + 6
Red --> 3 units - 2
Total --> 4 units + 4

There were twice as many red as blue at first
3 units - 2 = 2 units + 12
1 unit --> 14

At first, total number of marbles --> 4 x 14 + 4 = 60

cheers.

[Jamesbond]

Jamesbond:

MathIzzzFun:

[quote=\"Oracle\"]Here’s another:


During a mathematics test, Raymond scored 14 marks more than Krishnan and 7 marks more than Edison. Given that Raymond and Krishnan scored 73 marks more than Edison, what was Raymond’s score for the test?

Raymond scored 7 more than Edison
Raymond and Krishnan scored 73 more than Edison
so, Krisnan's score = 73-7=66
Raymond's score = 66 + 14 = 80
Edison's score = 80-7 =73


cheers.

Hi Mathizzzfun,
Can u please clear my doubt. I am not clear how do we get Krishnan's score by substracting 7 from 73.[/quote]Very clear now....Thank you...

[Jamesbond]

MathIzzzFun:

Jamesbond:

Eddie had thrice as many stickers as Angel. Eddie used 2/3 of his stickers and gave 1/4 of the remainder to Angel. Eddie then had 474 stickers left. How many stickers did Angel have at the end?


Pl help.... :scratchhead:

At first, Angel --> 4 units
Eddie --> 12 units

after Eddie used 2/3, left --> 4 units

Eddie gave 1/4 (= 1 unit) of remainder to Angel,
Eddie --> 3 units
Angel --> 5 units

3 units --> 474, 1 unit --> 158
In the end, Angel --> 5 x 158 = 790

cheers.

:thankyou:

[Oracle]

Thanks MathIzzzFun. Took me sometime to figure it out

[Oracle]

Just got this:


Marie baked 12 brownies of the same size. She gave an equal amount of the brownies to 5 friends. How many brownies did she give each friend?

Seems easy but doesn’t make sense to divide 12 by 5 and yet the question does not suggest that Marie should be included.

Anyone?

[PiscesLeo]

MathIzzzFun:

http://i45.tinypic.com/2vkm886.png\">

cheers.

:thankyou:

[Oracle]

Also, how should we approach a problem as such:


Stephanie and Jolene shared a total of 88 stickers. Stephanie gave half of her stickers to Jolene. Jolene in return gave half of what she had to Stephanie. In the end, Stephanie had 40 more stickers than Jolene. How many stickers did Stephanie have at first?

Thank you very much.

[tianzhu]

Oracle:

Also, how should we approach a problem as such:


Stephanie and Jolene shared a total of 88 stickers. Stephanie gave half of her stickers to Jolene. Jolene in return gave half of what she had to Stephanie. In the end, Stephanie had 40 more stickers than Jolene. How many stickers did Stephanie have at first?

Thank you very much.

Hi

You may use \"Work backwards\"

A quick check, the answer is 80 stickers for Stephanie.

I'll work out the slide tomorrow.

Best wishes

[Oracle]

Thank you very much Tianzhu, know what, I am still now struggling with this question & it still eludes me. Am feeling spaced out now. Can’t think anymore. Will look at your slide when it becomes available & try to figure it out. Sigh … learning is no longer fun … poor children …


Anyway, am very grateful for the help that I have received thus far.

Am totally drained now. Good night Tianzhu, MathIzzzzFun (urm really?) and Jamesbond.

[Oracle]

Hey Quekcc, thanks. Yes indeed the same save for the names … thank you. Hope Tianzhu sees this then Tianzhu won’t need to take the trouble.