Q&A - PSLE Math

[tianzhu]

Michaelia0816:

Step by step answer pls, cause don know lah!


2) The two tanks A and B was filled with some water. A is 1/5 filled with water while B is 1/3 with water. Water flows into both tanks at the same time from taps each at he rate of 1.8 litres per minutes. How long will it take for the water in both tanks to be of the same height?( Give your answer in minutes and seconds)
Tank A---- Height: 40cm
Length: 60cm
Breath: 10cm

Tank B---- Height: 36 cm
Length: 50 cm
Breath: 20 cm

Hi

At first

Water height@A ------- 8cm
Water height@B ------- 12cm

1.8 litres per minutes -------- 1800 cubic cm/min

In 1 min, height of water@A raised by 1800/600 or 3cm

In 1 min, height of water@B raised by 1800/1000 or 1.8cm

Difference in height ------- 1.2 cm

12-8 ------4

Time taken for water to be at same level ------- 4/1.2 ------ 3 mins 20 secs

Best wishes

[tianzhu]

Michaelia0816:

Tianzhu, help!


The figure below is formed by stacking 4 cardboard of equilateral triangles one on top of another. The triangles have sides 3cm,4cm,5cm and 6cm. The 6cm piece is triangle ABC. It is placed at he bottom of the stack followed by the 5cm piece, then the 4cm piece and the 3cm piece is right on top. What faction of the triangle ABC has only 2 layers of cardboard?

I am not sure of the phrase highlighted in red! Do give step by step answer!

Hi

Please post the figure.

Best wishes

[Michaelia0816]

Cannot leh. But can email. Wants to email, notice me!

[tianzhu]

Michaelia0816:

Cannot leh. But can email. Wants to email, notice me!

Hi

If the question is from top school past years papers, you may just provide a link to the paper.

The steps to insert a image

1) Do a print screen of the portion you want to upload.

2) Edit using Paint. Cut out the portion of the question you want to upload.

3) Save file in pictures

4) Go to Flickr (Free sign up as member) or other storage sites. Upload file. Select biggest/medium size. Right click to copy URL of image.

5) Coming back to Kiasuparents forum, click insert image button.

Best wishes

[peggy]

Please help with this .


At first Ravi had $200 more than Vincent. He gave 40% of his money to Vincent. Vincent then gave 25% of his money to Ravi. In the end, Vincent had $68 more than Ravi. how much did Vincent give Ravi ?


Thank you.

[speedmaths.012624com]

peggy:

Please help with this .


At first Ravi had $200 more than Vincent. He gave 40% of his money to Vincent. Vincent then gave 25% of his money to Ravi. In the end, Vincent had $68 more than Ravi. how much did Vincent give Ravi ?


Thank you.

Hi,

One possible solution is:

Let Vincent have 100u of money at first.
Let Ravi have (100u + $200) at first.

http://i45.tinypic.com/o6xpue.jpg\">

Hope this helps.

Cheers


speedmaths.com


.

[Michaelia0816]

Not use, never mind, I will try to solve it myself.

[Michaelia0816]

As the photo can be only saved in iPad, cannot upload to computer leh!!

[tianzhu]

Michaelia0816:

As the photo can be only saved in iPad, cannot upload to computer leh!!

Hi

Good Morning.

I am an old man, don’t know about ipad.

Ok, send your email through PM.

I’ll see if I can be of any help.

Best wishes

[Michaelia0816]

I post in using twitter,

Go to
pic.twitter.com/rg7SCB5F