Q&A - PSLE Math

[wkong]

Need help for the following question:-


Qn5

http://i55.tinypic.com/2nv9k7q.jpg\">

[stary]

wkong:

Need help for the following question:-


Qn5

http://i55.tinypic.com/2nv9k7q.jpg\">

Area of unshaded -> 8.5 x 9.4 = 79.9 cm2
Area of triangle -> 17+15.4 = 261.8 cm2
Shaded -> 261.8 - 79.9 = 181.9 cm2

[stary]

wkong:

Need help for the following question:-


Qn2

http://i51.tinypic.com/2q8d9bb.jpg\">

Unshaded/2 -> (1 - 1/4) / 2 = 3/8
1 rectangle -> 3/8 + 1/4 = 5/8
5/8 of figure ->5x 12 = 60 cm2
Figure -> 8/5 x 60 = 96 cm2

[stary]

wkong:

Need help for the following question:-


Qn3

http://i51.tinypic.com/21k0938.jpg\">

http://www.flickr.com/photos/64113082@N03/5946453944/in/photostream
Area -> (24 x 4)+(50 x 2) = 196 cm2
Area -> 196 - 24 - 30 - 50 = 92 cm2

[stary]

stary:

Hi all,


Have a question...

Ali and Baba ran in a race. When Baba had completed the race, Ali had only run 5/8 of the distance. Baba's speed was 75 m/min faster than Ali's speed. Both of them did not change their speeds throughout the race.
What was Ali's speed in m/min?

Appreciate your help... :?

Someone help me!

[wkong]

stary:

wkong:

Need help for the following question:-


Qn2

http://i51.tinypic.com/2q8d9bb.jpg\">

Unshaded/2 -> (1 - 1/4) / 2 = 3/8
1 rectangle -> 3/8 + 1/4 = 5/8
5/8 of figure ->5x 12 = 60 cm2
Figure -> 8/5 x 60 = 96 cm2

Thanks Stary.

[MathIzzzFun]

stary:

stary:

Hi all,


Have a question...

Ali and Baba ran in a race. When Baba had completed the race, Ali had only run 5/8 of the distance. Baba's speed was 75 m/min faster than Ali's speed. Both of them did not change their speeds throughout the race.
What was Ali's speed in m/min?

Appreciate your help... :?

Someone help me!

Hi

Ratio of Baba’s speed to Ali’s speed
=Sbaba: Sali
= 8u: 5u

Difference in speed = 3u = 75m/min
1u = 25m/min

Ali’s speed = 5u = 5 x 25m/min = 125m/min

cheers.

[MathIzzzFun]

wkong:

Need help for the following question:-


Qn4


http://i56.tinypic.com/xfdd9k.jpg\">

Hi

http://i52.tinypic.com/161aijn.jpg\">

cheers.

[stary]

MathIzzzFun:

stary:

[quote=\"stary\"]Hi all,


Have a question...

Ali and Baba ran in a race. When Baba had completed the race, Ali had only run 5/8 of the distance. Baba's speed was 75 m/min faster than Ali's speed. Both of them did not change their speeds throughout the race.
What was Ali's speed in m/min?

Appreciate your help... :?

Someone help me!

Hi

Ratio of Baba’s speed to Ali’s speed
=Sbaba: Sali
= 8u: 5u

Difference in speed = 3u = 75m/min
1u = 25m/min

Ali’s speed = 5u = 5 x 25m/min = 125m/min

cheers.[/quote]Thanks MathIzzzFun!

[stary]

wkong:

stary:

[quote=\"wkong\"]Need help for the following question:-


Qn2

http://i51.tinypic.com/2q8d9bb.jpg\">

Unshaded/2 -> (1 - 1/4) / 2 = 3/8
1 rectangle -> 3/8 + 1/4 = 5/8
5/8 of figure ->5x 12 = 60 cm2
Figure -> 8/5 x 60 = 96 cm2

Thanks Stary.[/quote]Glad to help...