Tutor MathsGuru: Ask me for your burning Maths questions!

[peapot]

Thanks for you help. But I still don’t quite get it. Why those numbers appear twice must by placed in the corner circle? Hmmm…is there any rule I can follow to explain why the numbers appear twice must be place in the corner?


Pardon me but my maths was quite lousy why I was younger.

[rubydoll]

My son told the maths paper was easy.

I thank the mathsguru team and esp Mr Dharma and Sweet girl vanilla cake for the marvellous work in helping us understand the sums.
Thank you again.
GOD BLESS YOU ALL.

[Dharma]

peapot:

Thanks for you help. But I still don't quite get it. Why those numbers appear twice must by placed in the corner circle? Hmmm.....is there any rule I can follow to explain why the numbers appear twice must be place in the corner?


Pardon me but my maths was quite lousy why I was younger.

Number that appear twice in the number bonds abovve is shared between 2 sides of the triangle. If u place 6 at the top most circle, 6 is common to the number bonds on the 2 sides of the triangle.

Similarly, 2 and 4 will have be shared by 2 different number bonds. Draw the numbers on the circle and you will see it clearly.

[Dharma]

rubydoll:

My son told the maths paper was easy.

I thank the mathsguru team and esp Mr Dharma and Sweet girl vanilla cake for the marvellous work in helping us understand the sums.
Thank you again.
GOD BLESS YOU ALL.

Hi rubydoll,

It is nice hear that your son found the paper easy and best wishes to him.

[peapot]

Oh ya!! How silly of me!! Now I understand…thanks!! Btw, can I use this same method for other questions of this nature?


You want to give tuition? My gal needs help leh!!

[oovi-yah]

zara had 70 more dresses than skirts.she sold 3/4 of the dresses and 3/5 of the skirts.she sold 126 more dresses than skirts .what fraction of the remaining clothes that zara had were skirts?

[Vanilla Cake]

rubydoll:

My son told the maths paper was easy.

I thank the mathsguru team and esp Mr Dharma and Sweet girl vanilla cake for the marvellous work in helping us understand the sums.
Thank you again.
GOD BLESS YOU ALL.

Hi rubydoll,

Thank you for addressing me as a sweet girl.
I think I look pretty while in P6 (2008) than in Sec 2 (2010) now.
Best wishes for your son in his studies cum PSLE 2010 exam and GBU.

[Muffins]

oovi-yah:

zara had 70 more dresses than skirts.she sold 3/4 of the dresses and 3/5 of the skirts.she sold 126 more dresses than skirts .what fraction of the remaining clothes that zara had were skirts?

Lowest Common Multiple of 4 and 5: 20

Skirts: 20 unit (u)
Dresses: 20 unit + 70

Sold: Skirts: 12u + 42
Dresses: 15u

Remaining: Skirts : 8u + 28
Dresses: 5u

15u = 12u + 42 + 126 (12u + 168)

(15 - 12)u = 168

1u = 168 ÷ 3 = 56

3 x 8 = 24

24 + 28 = 52 → Skirts
3 x 5 = 15 → Dresses

52/52+15 = 52/67

[iFruit]

oovi-yah:

zara had 70 more dresses than skirts.she sold 3/4 of the dresses and 3/5 of the skirts.she sold 126 more dresses than skirts .what fraction of the remaining clothes that zara had were skirts?

Let Dresses = 20d, skirts = 20s

20d - 20s = 70-----> (1)

3/4 of Dresses = 15d; remaining = 5d
3/5 of skirts = 12s; remaining = 8s

15d - 12s = 126------> (2)

required fraction = 8s/(5d+8s)

from (1) an (2), we get

4d -4s = 14
5d - 4s = 42
so,
d = 42 - 14 = 28------------> 5s = 140
4s = 4d -14 = 112 - 14 = 98----> 8s = 196


8s/(5d+8s) = 196/(140+196) = 196/336 = 49/84

[andante]

Ali was given 0.18litres of cough mixture by the doctor. He had to take 10ml of it every 4 hours. How many days would he take to finish the cough mixture ?


The answer given is 2 5/6 instead of 3.

Pls advise