Q&A - P5 Math

[Jamesbond]

janicelhl:

Hi, can someone help to solve


The number of shells in Box A was 12 more than that in Box B. When 96 shells were transferred from Box A to Box B, the number of shells in Box B became 3 times that of Box A. Find the total number of shells in Box A at first.

Thank you

My ds answer...
96-12=84
84*2=168
168+12=180
180/2=90
90+96=186.
186 shells.

[janicelhl]

My answer also 186

[Jamesbond]

janicelhl:

My answer also 186

:imcool:

[Charnic]

Pls help :

The no of students in class 5D was thrice as many as that of class 5C. After 15 students are transferred from D class to C class, the students in 5C was twice that of class 5D. How many students were there in 5C after the transfer ?
Thanks

[MathIzzzFun]

CNS:

Pls help :

The no of students in class 5D was thrice as many as that of class 5C. After 15 students are transferred from D class to C class, the students in 5C was twice that of class 5D. How many students were there in 5C after the transfer ?
Thanks

Total number of students remain the same.

Ratio method:
At first, 5D:5C -> 3:1
In the end, 5D:5C --> 1:2
Total number of students remain the same, so equalize total ratio parts.

At first, 5D:5C -> 9u:3u
In the end, 5D:5C --> 4u:8u
Students transferred --> 5u -- 15, 1u --> 3

Students in 5C after transfer --> 24

fraction method:
At first, number of students in 5D as a fraction of total number = 3/4 total
In the end, number of students in 5D as a fraction of total number = 1/3 total
number of students transferred out = 3/4 total - 1/3 total = 5/12 total

5/12 total --> 15
total --> 36

Number of students in 5C after transfer --> 2/3 x 36 = 24

cheers.

[Charnic]

Thanks. You are my saviour. I spent 20 minutes n still could not figure out the steps from her tuition teaacher. Your explanation is clear enough ! :rahrah:

[elisammom]

Hi All

Pls help TIA!

1) Madeline had 49 paper clips and jacob had 644 paper clips.
After their mother gave them each an equal number of paper clips, Madeline had 1/8 as many paper clips as Jacob.
How many paper clips did their mother give each of them?


2) Benny read 1/3 of a storybook on Mon and 5/6 of the remainder on Tues.
He completed reading the rest of the 48 pages on Wed.
How many pages were there in the book?

Thanks

[Charnic]

For question 1,


7 U ---- 595
U -------85

M is 85-49, mum gives 36

For question 2,

1/3 on MOnday, 5/9 on Wed. Remaining is 1 - 1/3 - 5/9, balance is 1/9 which equals to 48
U ----- 48
Total pages is 48 * 9 = 432 pages altogether

[elisammom]

CNS:

For question 1,


7 U ---- 595
U -------85

M is 85-49, mum gives 36

For question 2,

1/3 on MOnday, 5/9 on Wed. Remaining is 1 - 1/3 - 5/9, balance is 1/9 which equals to 48
U ----- 48
Total pages is 48 * 9 = 432 pages altogether

Hi CNS, Thanks for your promptly reply:)

However I cant get it why 7U is 595 (644-49). Where is the additional amt that mom has given?
Pls help thanks!

[tianzhu]

sokk:

Hi,


Have a question on average that I need help with. Thanks !

Bin has $30 more than Ron.
Wei has 4/3 of the average of what Ron and Bin have.
The average amount that Bin and Wei have is 1.5 of Ron's money.
How much money does Wei have?

Thanks !

Hi

You may work using MD or units.

Ron ----- 6 units

Bin ----- 6 units + 30

Average of Ron and Bin ----- 6 units + 15

Wei has 4/3 of the average of what Ron and Bin have.

Hence, Wei ----- 8 units + 20

Total amount of Bin and Wei ----- 14 units + 50 (6 units + 30 + 8 units + 20)

Average of Bin and Wei ----- 7 units + 25

1.5 of Ron’s money ------ 9 units (1.5*6)

7 units + 25 ----- 9 units

1 unit ----- 12.5

Wei ----- 8*12.5 + 20 ----- 120

Best wishes