Tutor MathsGuru: Ask me for your burning Maths questions!

[MathIzzzFun]

Herbie:

I hv two qn


1. 5/6-2x + 2x-7/x^2-9

2. X^2-4xy+4y^2 =0, find 2x/y

Thanks

Hi

I believe you have omitted some brackets in the question 1, I have re-write it below - hope it is correct.

http://i50.tinypic.com/14ebdhe.png\">

cheers.

[Herbie]

Thanks!


Can assist on the following qns?

Factorise a(b^2-c^2)-bc(b-c)
Wat do we look out for when doing such qn?

Factorise 4a^2-b^2a-b completely.

Factorise 8/25a^2 -32b^2.
Do u hv any tips in solving qn?

[Herbie]

Deleted

[MathIzzzFun]

Herbie:

Thanks!


Can assist on the following qns?

Factorise a(b^2-c^2)-bc(b-c)
Wat do we look out for when doing such qn?

Factorise 4a^2-b^2a-b completely.

Factorise 8/25a^2 -32b^2.
Do u hv any tips in solving qn?

Hi

the questions are practices for factorisation of
(a+b)(a-b) = a^2-b^2

you may want to try it - factorise a^2-b^2 into (a+b)(a-b) and then look for the common factors, taking note that 4a^2-b^2 can be factorised into (2a+b)(2a-b) ie 4a^2 = (2a)^2.

cheers.

[ongmt]

1) At a party, there were some ballons, 25 ballon burst & 10% of remaining ballons fly away. If only 60% of the ballons were left, how many ballons were there at first?


2) Pkt A, B and C each contained some cement. 1/3 of cement was transferred from Pkt A to B. Then 1/3 of the cement transfer from Pkt B to C. Finally, 1/3 of cement transferred from Pkt C to A. In the end, there were 12kg of cement in each pkt. Whar was the mass of cement in Pkt B at first?

3) A fan club had 150 member last yr. This yr, the no of male member reduced by 20% and number of female member increas by 20%. As a result, there are now as man male member as female members. How many memebers does the club have this year?

Plse help :udaman:

[josephgiri]

ongmt:

2) Pkt A, B and C each contained some cement. 1/3 of cement was transferred from Pkt A to B. Then 1/3 of the cement transfer from Pkt B to C. Finally, 1/3 of cement transferred from Pkt C to A. In the end, there were 12kg of cement in each pkt. Whar was the mass of cement in Pkt B at first?

This is a 'constant total' or 'internal transfer' type of qn.

Working backward

At the end,
A:B:C = 12:12:12

1/3 from C to A,
2 units left in C
1 unit -> 6 kg
A:B:C = 6:12:18

1/3 from B to C,
2 units left in B
1 unit -> 6 kg
A:B:C= 6:18:12

1/3 from A to B,
2 units left in A
1 unit -> 3 kg
A:B:C=9:15:12

Pkt B had 15 kg of cement initially.

[josephgiri]

ongmt:

1) At a party, there were some ballons, 25 ballon burst & 10% of remaining ballons fly away. If only 60% of the ballons were left, how many ballons were there at first?

9 units -> 60%
1 unit -> 6 2/3%
10 units -> 66 2/3%

100% - 66 2/3% = 33 1/3%
33 1/3% -> 25 balloons
100% -> 75 balloons

There were 25 balloons at first.

[MathIzzzFun]

ongmt:

1) At a party, there were some ballons, 25 ballon burst & 10% of remaining ballons fly away. If only 60% of the ballons were left, how many ballons were there at first?



3) A fan club had 150 member last yr. This yr, the no of male member reduced by 20% and number of female member increas by 20%. As a result, there are now as man male member as female members. How many memebers does the club have this year?

Plse help :udaman:

Hi

Q1.
9/10 remaining balloons (after 25 burst)= 3/5 Total = 9/15 Total
Total --> 15units
Remaining balloons --> 10 units
5 units --> 25
15 units --> 75
There were 75 balloons at first.

Q3.
4/5 male = 12/10 female
12/15 male = 12/10 female
Last year
Male --> 15 units
Female --> 10 units
total 25 units --> 150
Male --> 90
Female --> 60
This year, Male --> 72, Female --> 72, total 144 members.

cheers.

[imacsg]

Hi,

Can you help to solve the below question

find x : 10, 16, 26, 40, 58, x

Thanks

[MathIzzzFun]

imacsg:

Hi,

Can you help to solve the below question

find x : 10, 16, 26, 40, 58, x

Thanks

Hi

x = 80

One way to solve number pattern is to find the difference of two consecutive terms... and repeat for pattern of \"difference\" until the difference is a constant.

For this case, you can work out the 1st level difference pattern : 6,10,14,18
and then down one more level and get the 2nd level difference pattern :
4,4,4
So, the 5th number in the 1st level difference pattern is 18+4 = 22
and x = 58 + 22 = 80

cheers.