Q&A - P5 Math

[smartmummy]

2Transformer:

smartmummy:

[quote=\"2Transformer\"]I need your help to solve this question.



Question:

The ratio of the number of library books in School ABC to the number of library books in School XYZ was 5:4. When 1424 books from School ABC were loaned to School XYZ, the ratio of the number of books in School ABC to the number of books in School XYZ became 13:14.

(a) What fraction of the books in School ABC was loaned to School XYZ ?
(b) How many books were there in School XYZ at first?

ABC:XYZ
5:4
15:12
After
13:14
a) 2/15 (15-13=2)
b)1424/2=712
12*712=8544

Thank you.

Btw, can you explain why the ratio 5:4 multiply by 3? And why the denominator is 15? My son does not understand it.

TIA[/quote]5:4 means ABC---- 5units, XYZ----4units
if we divide the one unit into three we can get ABC----5*3=15parts, XYZ--- 4*3=12parts [I divide or simply multiply by 3 to get a bigger number than 13 as 1424 books from School ABC were loaned to School XYZ]
And why the denominator is 15?
cos now total of 15parts in ABC

[smartmummy]

carol73:

hi

pls help
The ratio of the number of stickers Patricia has to the number James has is 5:2
when Patricia gives 50 stickerss to James, she still have 80 stickers more than James. How many stickers does James have at first

P:J=5:2---- Pa --5units, James---2units

P[][][50[80] [50]
J [][][50]
3u=50+80+50=180
1u=60
2u=2*60=120
James have 120 stickers at first

[shaz]

Hi need help on this question pls


3 children sold some tickets. A sold 5/8 of the tickets. B sold 36 fewer than A. C sold 20 tickets. How many tickets did they sell altogether? Thanks

[PapayaDad]

Total = 8u

A=5u
B=5u-36
C=20

5u+5u-36+20=8u
10u-16=8u
10u-8u=16
2u=16
u=8

Total = 8u = 8 x 8 = 64

[2Transformer]

Thank you, smartmummy. I really appreciate it.

[shaz]

Thank you very much Payapadad! Am stuck wz another


L & M & N shared the cost of a present. L paid 1/4 of the total share of M&N. M paid 1/9 of the total share of L&N. N paid $60 more than M. What is the cost of the present? Many thanks to anyone who can help

[Oldschool]

shaz:

Thank you very much Payapadad! Am stuck wz another


L & M & N shared the cost of a present. L paid 1/4 of the total share of M&N. M paid 1/9 of the total share of L&N. N paid $60 more than M. What is the cost of the present? Many thanks to anyone who can help

Hi,

L : M + N
1 : 4 (total 5)
2 : 8 (total 10, total unchanged)

M : L + N
1 : 9 (total 10)

So,
L : M : N
2 : 1 : 7 (total 10, total unchanged)
2U : U : 7U

N-M -->7U – U --> 6U -->60
U -->10

Cost -->10U--> $100


Similar type of question but same/different approach,

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?p=997863#p997863

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?p=998230#p998230

Regards

[shaz]

Thank u very much Oldschool. Really appreciate your help

[doraemo]

smartmummy:

doraemo:

pls help

(2)\tIn April A,B C and D had a total of $324. In May , the savings of the 4 girls became equal when A’s savings was doubled, B’s savings was reduced by $4, C’s saving remained unchanged and D’s savings was increased by $9. What was B’s and D’s savings in April?

In May
A [ u ][u ]
B [ u ][u ] 4
C [ u ][u ]
D [u][u-9]

In Apr
u+2u+4+2u+2u-9=324


7u=329
u=47
B's in April=2*47+4=$98
D's in April=2*47-9=$87

Thank you, smartmummy!!!!

pls help , qn 1....
(1) W and R collect stamps. If R gives W 15 stamps, he will have the same number of stamps as W. If W gives R 15 stamps, he will have ½ as many stamps as R. How many stamps does each of them have?

[smartmummy]

Hi doraemo!

I tried my best, but i couldn’t solve the qn1. May someone else help u.