Q&A - P4 Math

[Musings]

2/5 = 3/5

6/15 = 6/10

(The key is to make the numerator the same in both fractions.)

Total units of fiction books = 15
Total units of non fiction books = 10

25 units = 125
1 unit = 5
Total fiction books = 15 x 5 = 75
Total non fiction books = 10 x 5 = 50

There are 25 more fiction books than non fiction books.

[J and J]

2/5 of fiction (F) = 3/5 of non-fiction (N)

fiction(F) + non-fiction(N) = 125
2/5 F = 3/5 N
F+N = 125
F =125-N
=> 2/5 (125-N) = 3/5 N
=> 50-2/5N = 3/5N
=> 50 = N
=> F = 125 -N
=> F = 75

=> F-N =75-50
= 25
So there are 25 more fiction than non-fiction in the collection

[Jamesbond]

Thanks a lot for ur explanation

[Jamesbond]

why do u do 2 x 66 for 3 units…can u pl explain that part. Thanks in advance.

[Jamesbond]

Lim had less than 30 marbles. She gave some marbles to her children. If she gave each child 6 marbles, she would have 5 extra marbles. If she gave each child 8 marbles, she would need 1 more marble. How many marbles did she have?


Pl explain for me

[Jamesbond]

Express 70/6 as a decimal rounded off to the nearest hundredth?


70/6 = 11 4/6

11 4/6 = 11 2/3

11 2/3 = 11.67 is the answer.I don’t understand how to convert 11 2/3 in to 11.67. pl help.

[J and J]

http://i50.tinypic.com/1z4imtx.png\">

Jamesbond:

why do u do 2 x 66 for 3 units...can u pl explain that part. Thanks in advance.

[Jamesbond]

Thank you J and J

[J and J]

Jamesbond:

Lim had less than 30 marbles. She gave some marbles to her children. If she gave each child 6 marbles, she would have 5 extra marbles. If she gave each child 8 marbles, she would need 1 more marble. How many marbles did she have?


Pl explain for me

By guess & check
Lim has < 30 marbles
Marble @ child No. of child total marbles < 30 marbles
6 4 4x6+5 = 29 yes
8 4 4x8 -1 = 31 No
6 3 3x6+5 = 23 yes
8 3 3x8 -1 = 23 yes

So she has 23 marbles.

[Jamesbond]

:thankyou: J and J