Tutor MathsGuru: Ask me for your burning Maths questions!

[MathIzzzFun]

rrjan:

Hi MathsIzzzFun,


Thanks for your kind revert. Will ask my son to check with his teacher again. This was adapted from his school's past year exam paper for P3.

My hubby tried to figure it out and came up with this explaination.

Told me to use guess and check method. Taking a presumption that these strings are like strings on a guitar. Since string P is 8 cm longer than string Q, we would also presume that string R is 8 cm shorted than string Q. In order to find string Q, we take 54 /2, and we will get 27. If Q is 27cm, P will be 27cm + 8 cm = 35cm, R = 27cm = 8 cm = 19cm

String P + String R = 35cm + 19cm = 54cm

I kind of understand his expalination, but how to explain it more clearly to my boy?

Hi

There is definitely missing information in the question. As it is, there are countless number of possible answers. Since the question did not provide any information on the individual strings, we cannot assume that string R is 8 cm shorter than string Q.

P + R = 54 cm
P = Q + 8 cm
So, Q + 8 cm + R = 54 cm
Q + R = 46 cm
So, it is not possible to have only 1 answer for Q, since R is unknown, and Q can take any value that satisfy the statement Q + R = 46 cm.

cheers.

[rrjan]

Noted your kind revert. Will get my boy to check with his MAths teacher when he returns to school. Thanks again

[kwcllf]

Hi,


Please help with the following question:

600 Blue cubes and 1000 Green cubes are kept in Container A. 1000 Blue cubes and 400 Green cubes are kept in Container B. Some cubes are transferred from Container B to Container A. After the transfer, the number of Blue cubes is the same as the number of Green cubes in Container A and the number of Blue cubes in thrice the number of Green cubes in Container B.

a) Find the number of Green cubes transferred from Container B to Container A.
B) Find the total number of cubes transferred from Container B to Container A.


Thanks!

[kwcllf]

Hi,


Please help with the following question.

Fig1...................................Fig 2.........................Fig 3
..X.....................................XX...........................XXX
.XXX..................................XXXX........................XXXXX
...X...................................XXXX........................XXXXX
.........................................XX..........................XXXXX
........................................................................XXX

Which Figure is made up of 10,197 X ?

[MathIzzzFun]

kwcllf:

Hi,


Please help with the following question:

600 Blue cubes and 1000 Green cubes are kept in Container A. 1000 Blue cubes and 400 Green cubes are kept in Container B. Some cubes are transferred from Container B to Container A. After the transfer, the number of Blue cubes is the same as the number of Green cubes in Container A and the number of Blue cubes in thrice the number of Green cubes in Container B.

a) Find the number of Green cubes transferred from Container B to Container A.
B) Find the total number of cubes transferred from Container B to Container A.


Thanks!

Hi

After transfer :
A = * *
B= # # # #

Total Green cubes = 1400 = * + #
Total Blue cubes = 1600 = * + # # #
So, # # = 200, # = 100, * = 1400 - 100 = 1300

.. i think you can complete the rest..

cheers.

[MathIzzzFun]

kwcllf:

Hi,


Please help with the following question.

Fig1...................................Fig 2.........................Fig 3
..X.....................................XX...........................XXX
.XXX..................................XXXX........................XXXXX
...X...................................XXXX........................XXXXX
.........................................XX..........................XXXXX
........................................................................XXX

Which Figure is made up of 10,197 X ?

Hi

This doesn't look like a p5/6 question.. more like MO type ..

Fig 1 = 1x3 + 1x2
Fig 2 = 2x4 + 2x2
Fig 3 = 3x5 + 3x2
Fig n = n x (n+2) + n x 2 = n(n+4) = (n+2)^2-4

10197 = (n+2)^2-4
(n+2)^2 = 10201
n+2 = sqrt(10201) = 101
n = 99

Fig 99 made up of 10197 X

cheers.

[kwcllf]

Hi MathIzzzFun,


Once again thanks for the great help!

The question is given to my P5 kid. By the way, what MO stands for?

[concern_mum]

Hi Guru, this is concern_mum again, can you help me with question below:


There were 512 tickets to the YOG opening and closing ceremoney for sale. After 3/4 of the opening ceremony tickets were sold, the number of opening ceremony tickets left was 3/7 of the total number of tickets left.

a) How many closing ceremony tickets were there?
b) If the tickets were sold at $80 each, how much money was collected from the sales of the opening ceremony tickets?

Thank you.

[applepie]

Hi,


Can anyone help with this question…my boy and I both tried this question but got a different answer from the answer key :

Garry had twice as many stamps as Henry. After Henry gave away 98 stamps, Garry had 4 times as many stamps as Henry. How many stamps did both of them have at first?

Thanks.

[concern_mum]

applepie:

Hi,


Can anyone help with this question...my boy and I both tried this question but got a different answer from the answer key :

Garry had twice as many stamps as Henry. After Henry gave away 98 stamps, Garry had 4 times as many stamps as Henry. How many stamps did both of them have at first?

Thanks.

Hi applepie,
This is what I think...
Garry : Henry
2:1
and 2:1 is also equivalent to 4:2 (i.e. total 6 units)
one unit was given away (which is equivalent to 98 stamps) to achieve 4:1 ratio.
Before the one unit was given away, there were a total of 6 units.
Since one unit = 98, the total number of stamps originally was 6 x 98 = 588.

Hope this helps:)