Q&A - PSLE Math

[MathIzzzFun]

bobsg01:

Thank you MathIzzzFun for the solution.


Cheers. :rahrah: :rahrah: :rahrah:

avec plaisir

cheers.

[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 .

[linden2000]

40% is $300 + $100 =$400

100% is $1000
SP at shop A b4 disct is $1000
SP at shop B is (0.9 x 1000) -300 =$600

[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.

[stary]

Hi all, I have 3 questions to ask…

[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

[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

[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

[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.