SOS mum wrote:Hi, ps help. Many tks and God Bless:)

1) 2 identical boxes, Box A and Box B, contained some sand. When 2.4kg of sand was moved from Box B to Box A, the mass of Box B was four times the mass of Box A. If another 0.8kg of sand was moved from Box B to Box A, the mass of Box B would be 3 times the mass of Box A. Find the mass of Box B at first.

## Q&A - PSLE Math

### Re: Q&A - PSLE Math

### Re: Q&A - PSLE Math

Ender wrote:SOS mum wrote:Hi, ps help. Many tks and God Bless:)

1) 2 identical boxes, Box A and Box B, contained some sand. When 2.4kg of sand was moved from Box B to Box A, the mass of Box B was four times the mass of Box A. If another 0.8kg of sand was moved from Box B to Box A, the mass of Box B would be 3 times the mass of Box A. Find the mass of Box B at first.

### Re: Q&A - PSLE Math

In order for both containers to weigh the same, amount of weight to transfer = (22.3-11.9)/2 = 5.2kgSOS mum wrote:Hi, ps help. Many tks and God Bless:)

2) There are 2 identical containers, Containers A and B. Container A is filled with cement and its total mass is 22.3kg. Container B is filled with water and its total mass is 11.9kg. If 1/3 of the cement in Container A is poured into Container B, they would weigh the same. Find the mass of the empty container in grams.

1/3 of cement weighs 5.2kg

3/3 cement weigh =5.2 X 3 = 15.6kg

Weight of container = 22.3 - 15.6 = 6.7kg = > 6700g

### Re: Q&A - PSLE Math

Someone Please help~ thanks in advance... Can anyone help to explain the solution please...

### Re: Q&A - PSLE Math

You can imgaine figure A is made up of 2 cuboids on top of each other.belnanna wrote:Someone Please help~ thanks in advance... Can anyone help to explain the solution please...

The top cuboid = 16 X 10 X 2 = 320cc

The bottom cuboid = 20 X 10 X 2 = 400cc

a) Total volume of Figure A = 320+400=720 cc

b) For 5616 cc of water, number of full tank = 5616/720 = 7.8

There'll will be 7 full tanks, water contain in the 7 tanks = 7 * 720 = 5040cc

Leftover water to filled the top last tank, (i.e 8th tank) = 5616-5040 = 576cc

Looking at figure A, out of 576cc, 400cc is used to filled the bottom cubiod, leaving 176cc for the top cuboid.

Base area of top cuboid= 16X10= 160cm2

height of water level for the top cuboid = 176/160 = 1.1cm

Total height of water level, = Height of the 7 tanks (7 X 4) + height of lower cuboid of figure A(2cm) + 1.1cm

=7 X 4 + 2 + 1.1 = 31.1cm

### Re: Q&A - PSLE Math

Ender wrote:You can imgaine figure A is made up of 2 cuboids on top of each other.belnanna wrote:Someone Please help~ thanks in advance... Can anyone help to explain the solution please...

The top cuboid = 16 X 10 X 2 = 320cc

The bottom cuboid = 20 X 10 X 2 = 400cc

a) Total volume of Figure A = 320+400=720 cc

b) For 5616 cc of water, number of full tank = 5616/720 = 7.8

There'll will be 7 full tanks, water contain in the 7 tanks = 7 * 720 = 5040cc

Leftover water to filled the top last tank, (i.e 8th tank) = 5616-5040 = 576cc

Looking at figure A, out of 576cc, 400cc is used to filled the bottom cubiod, leaving 176cc for the top cuboid.

Base area of top cuboid= 16X10= 160cm2

height of water level for the top cuboid = 176/160 = 1.1cm

Total height of water level, = Height of the 7 tanks (7 X 4) + height of lower cuboid of figure A(2cm) + 1.1cm

=7 X 4 + 2 + 1.1 = 31.1cm

Thanks so much Ender~

- Swift Formula
- BlueBelt
**Posts:**246**Joined:**Thu Jun 25,**Total Likes:**2

### Re: Q&A - PSLE Math

Sorry was very buzy. Injure my footbelnanna wrote:Swift Formula wrote:a) Volume = Base x Height

b) 5616 / AnsA = AnsB with remainder

AnsB x 4cm = Height

Water Level = Height + Height of remainder

To find height of remainder please go calculate base area of Figure A and until what height the base area will change.

I'm Sorry.. Please explain more.. Still dont understand your meaning of ""until what height the base area will change"" Thanks in advance

Thank you Ender.

anna

- Swift Formula
- BlueBelt
**Posts:**246**Joined:**Thu Jun 25,**Total Likes:**2

### Re: Q&A - PSLE Math

Draw model. Or list out like me.Wgh2005 wrote:Hi, can someone help me with the below question. Thank you!

A = 1 unit

B = 2 units

C = 6 units

D = 8 units

C/Total = ?

- Dragon Flame
- OrangeBelt
**Posts:**90**Joined:**Thu Oct 16,