Q&A - PSLE Math

[Vanilla Cake]

P5G:

Hi Vanilla Cake,

Option (2) is correct.
This is how my mum worked out the answer.
Join opposite edges to get 6 equilateral triangles.
The area of the shaded triangle is equal to 2 equilateral triangle as its height is twice an equilateral triangle and their bases are the same.
So answer is 2/6 = 1/3, which is option (2).

Hi P5G,
Your mum is correct and option (2) is the correct answer. So, 2 precious marks gone and my younger sister got 98/100 for this Rosyth 2011 P6 Prelim Maths paper. :stupid:
Thks for the tips from your mum.

[raghupavithra]

The average height of 2 girls is 1.50m. The difference in their height is 0.4m. What is the height of the taller girl?


1.10
1.30
1.54
1.70
pls help

[tianzhu]

raghupavithra:

The average height of 2 girls is 1.50m. The difference in their height is 0.4m. What is the height of the taller girl?


1.10
1.30
1.54
1.70
pls help

Hi

2*1.5 -----3

3-0.4 ----- 2.6

2.6/2 ------ 1.3

1.3 + 0.4 ------ 1.7 (ans)

Best wishes

[tianzhu]

Hi


Hope this helps.

Best wishes.

http://farm7.static.flickr.com/6177/6160679750_ff917d0516_z.jpg\">

[zsqchx]

Please help me to solve Q 16 of Henry park 2011


Mr Lee took 7 hours to tavel from town A to Town B while Mr Wong took 8 hours to travel from Town B to Town A. Both of them did not change their speed throughout the journey. Both of them started off at the same time and moved towards each other. 3 hours later, they were 110 km apart. what was the speed Mr Lee was driving?

Thanks

[tianzhu]

zsqchx:

Please help me to solve Q 16 of Henry park 2011


Mr Lee took 7 hours to tavel from town A to Town B while Mr Wong took 8 hours to travel from Town B to Town A. Both of them did not change their speed throughout the journey. Both of them started off at the same time and moved towards each other. 3 hours later, they were 110 km apart. what was the speed Mr Lee was driving?

Thanks

Hi

Good Morning.

As in any question on “Speed”, it’s helpful to draw a simple diagram showing the relationships between two motorists.

Use a common multiple of 56 (7 and

Mr Lee
1h ------ 8 units

Mr Wong
1h ------7 units

In 1h they travelled 15 units
In 3h, they travelled 45 units.

56 – 45 ------11
11units ------ 110

1 unit ------ 10
8 units ------80

Mr Lee ------- 80km/h

Best wishes

[zsqchx]

tianzhu:

zsqchx:

Please help me to solve Q 16 of Henry park 2011


Mr Lee took 7 hours to tavel from town A to Town B while Mr Wong took 8 hours to travel from Town B to Town A. Both of them did not change their speed throughout the journey. Both of them started off at the same time and moved towards each other. 3 hours later, they were 110 km apart. what was the speed Mr Lee was driving?

Thanks

Hi

Good Morning.

As in any question on “Speed”, it’s helpful to draw a simple diagram showing the relationships between two motorists.

Use a common multiple of 56 (7 and

Mr Lee
1h ------ 8 units

Mr Wong
1h ------7 units

In 1h they travelled 15 units
In 3h, they travelled 45 units.

56 – 45 ------11
11units ------ 110

1 unit ------ 10
8 units ------80

Mr Lee ------- 80km/h

Best wishes

Hi Tianzhu,

Thank you for your help

[tianzhu]

htn:

tianzhu

thanks.

Hi

You're welcome.

Best wishes

[tianzhu]

P.KH:

Dear tianzhu , thanks a lot for your quick reply .. It was really helpful . 

Hi

You're welcome.

Best wishes

[tianzhu]

zsqchx:

Hi Tianzhu,

Thank you for your help

Hi

You're welcome.

Best wishes