Q&A - P3 Math

[Florence88]

The ratio of the number of marbles to the number of mosiac was 4 : 5. After some mosaic were added, 40% of the new total were mosaic. What was the percentage increase in the number of mosaic

[James Ang]

Florence88:

The ratio of the number of marbles to the number of mosiac was 4 : 5. After some mosaic were added, 40% of the new total were mosaic. What was the percentage increase in the number of mosaic

Something seems wrong with this question.

Before ratio
Marble : Mosaic
4:5
= 12:15

After ratio
6:4
= 12:8

The number of mosaic in fact decrease if the marbles are the same.

[Florence88]

Apology, whether question should be :


…40% of the new total were marbles…
[/b]

[Florence88]

Apology, whether question should be :


…40% of the new total were marbles…
[/b]

[Florence88]

Apology, whether question should be :


…40% of the new total were marbles…
[/b]

[annloww]

HI All

Need help to solve the following problem

which one of the folloswing no, when added to 3178 will allow regrouping of the ones and hundreds ?

1) 6732
2) 6597
3) 5914
4) 5832

Thank you so much :celebrate: :celebrate:

[concernParent777]

Hi all,


I was running through my child's paper and I am actually stuck in 2 questions. Do you guys have any advice? Which method should I use, I thought of using LCM, but apparently I dont think it works on these questions

http://postimage.org/image/2qtipkcjo/

http://postimage.org/image/2qtpbpqis/

[concernParent777]

Hi all,


I was running through my child's paper and I am actually stuck in 2 questions. Do you guys have any advice? Which method should I use, I thought of using LCM, but apparently I dont think it works on these questions
http://postimage.org/image/2qv68wubo/

http://postimage.org/image/2qvq3d090/

[iFruit]

concernParent777:

Hi all,


I was running through my child's paper and I am actually stuck in 2 questions. Do you guys have any advice? Which method should I use, I thought of using LCM, but apparently I dont think it works on these questions
http://postimage.org/image/2qv68wubo/

http://postimage.org/image/2qvq3d090/

How about branching method?

[24hr-mum]

annloww:

HI All

Need help to solve the following problem

which one of the folloswing no, when added to 3178 will allow regrouping of the ones and hundreds ?

1) 6732
2) 6597
3) 5914
4) 5832

Thank you so much :celebrate: :celebrate:

regrouping means the addition of 2 digits must be more than 10
all the ones in the 4 choices allowing regrouping
now, for option 1, the hundreds digit ie 7 and 1 when adding 6732 and 3178, doesnt allow for regrouping as 7+1+the ten carried forward when adding the tens in the two numbers, is only 9.

if u work thru, the answer shd be no. 3 i think (ie regrouping only ones and hundreds), as for no. 4 must regroup the tens as well as ones and hundreds