Q&A - PSLE Math

[stary]

Your help is greatly appreciated! :thankyou:

[MathIzzzFun]

stary:

1:


ABCD is parrellelogram and its area is given to be 41.6 cm2. If AD = 5.9 cm, AB = 10 cm, Angle DAB = 45 Degree and BE is an arc of a circle with centre A and BF is an arc of a circle with centre C, find the area of the shaded regions.

http://www.flickr.com/photos/64113082@N03/5926265200/in/photostream

Hi

http://i56.tinypic.com/xni2qf.jpg\">

cheers.

[MathIzzzFun]

stary:

2:


In the diagram, ABC is an equilateral triangle.
The height of the triangle is CD = AE and AD = DB = BE = EC = 4 cm.
O is the centre of the circle with radius 2.31 cm and the area of the sector ODE is 1/3 the area of the circle. Find the area of the shaded region, correct to 2 decimal places.

http://www.flickr.com/photos/64113082@N03/5925704569/in/photostream

Hi

http://i55.tinypic.com/2s6ue5u.jpg\">

cheers.

[MathIzzzFun]

stary:

3.


A container filled with some water shown in Figure 1 below has a rectangular base area of 10.4 cm2. Figure 2 shows the same container being turned upside down.
(a) Find the capacity of the container in cm3, correct to 2 decimal places.
(b) If the water in the container is transferred to another cube-shaped container of capacity 90 cm3, find the height of the water level in the cube-shaped container.

http://www.flickr.com/photos/64113082@N03/5926261454/in/photostream

Hi

http://i51.tinypic.com/2d9wpy1.jpg\">

cheers.

[Andrew Lee]

MathIzzzFun:

Andrew Lee:

A coin box contained some $0.20 cent & $0.50 cent coins in the ratio of 4 : 5. When 16 $0.50 cent coins were taken out and replaced by some $0.20 cent coins, the ratio then became 8 : 7. The total value of the $0.20 cent coins added was the same as the total value of the $0.50 cent coins taken out. Find the sum of money in the coins box .

Hi

hope this helps

http://www.flickr.com/photos/62167097@N02/5924456939/in/photostream

cheers.

Thank you so much :rahrah:

[MathIzzzFun]

Andrew Lee:

MathIzzzFun:

[quote=\"Andrew Lee\"]A coin box contained some $0.20 cent & $0.50 cent coins in the ratio of 4 : 5. When 16 $0.50 cent coins were taken out and replaced by some $0.20 cent coins, the ratio then became 8 : 7. The total value of the $0.20 cent coins added was the same as the total value of the $0.50 cent coins taken out. Find the sum of money in the coins box .

Hi

hope this helps

http://www.flickr.com/photos/62167097@N02/5924456939/in/photostream

cheers.

Thank you so much :rahrah:[/quote]u r welcome

cheers.

[stary]

Thanks MathIzzzFun!!!

[Daddy]

Hi stary,


Joey : John
5 units : 1 unit
+$59 +$49
2 parts : 1 part

2 units + $98 = 5 units + $59
3 units -> $98-$59 = $39
5 units -> 5/3 x $39 = $65

The number in bold i did not understand. please...
How did you get it? Thanks

[stary]

Daddy:

Hi stary,


Joey : John
5 units : 1 unit
+$59 +$49
2 parts : 1 part

2 units + $98 = 5 units + $59
3 units -> $98-$59 = $39
5 units -> 5/3 x $39 = $65

The number in bold i did not understand. please...
How did you get it? Thanks

Hope this helps...
Joey : John
5 units : 1 unit
+$59 +$49
2 parts : 1 part

2 units + $98 = 5 units + $59
3 units -> $98-$59 = $39
5 units -> 5/3 x $39 = $65

(1 unit +$49) x 2 = 2 units + $98

[stary]

Hi all,

Need help again...


Two identical quadrants of a circle overlap each other as shown in the diagram below. The area of the square is 10 cm2. Find the area of the shaded regions, giving your answer in two decimal places.

http://www.flickr.com/photos/64113082@N03/5930094820/in/photostream