Q&A - PSLE Math

[Ender]

Mrs. Lim bought some white rice and some brown rice. She cooked an equal amount of white and brown rice. She had 3/4 of the white rice and 3/8 of the brown rice left. What fraction of the rice which Mrs. Lim bought was cooked?

White Rice, Cooked : Uncooked : total
1 : 3 : 4

Brown rice, Cooked : Uncooked : Total
5: 3 : 8

The amount of rice cooked is equal for bronw and white, we can common the cooked rice for them to share common unit.
White Rice, Cooked : Uncooked : Total
5 : 15 : 18

Total rice bought = 18 + 8 =26u
Total rice cooked = 5 + 5 = 10u

Fraction of rice cooked/bought = 10/26 => 5/13

[EC72]

Mrs. Lim bought some white rice and some brown rice. She cooked an equal amount of white and brown rice. She had 3/4 of the white rice and 3/8 of the brown rice left. What fraction of the rice which Mrs. Lim bought was cooked?

White Rice, Cooked : Uncooked : total
1 : 3 : 4

Brown rice, Cooked : Uncooked : Total
5: 3 : 8

The amount of rice cooked is equal for bronw and white, we can common the cooked rice for them to share common unit.
White Rice, Cooked : Uncooked : Total
5 : 15 : 18

Total rice bought = 18 + 8 =26u
Total rice cooked = 5 + 5 = 10u

Fraction of rice cooked/bought = 10/26 => 5/13

Thank you so much, Ender! Minor correction...

The amount of rice cooked is equal for brown and white, we can common the cooked rice for them to share common unit.
White Rice, Cooked : Uncooked : Total
5 : 15 : 20

Fraction of rice cooked/bought = 10/28 => 5/14

[Ender]

Mrs. Lim bought some white rice and some brown rice. She cooked an equal amount of white and brown rice. She had 3/4 of the white rice and 3/8 of the brown rice left. What fraction of the rice which Mrs. Lim bought was cooked?

White Rice, Cooked : Uncooked : total
1 : 3 : 4

Brown rice, Cooked : Uncooked : Total
5: 3 : 8

The amount of rice cooked is equal for bronw and white, we can common the cooked rice for them to share common unit.
White Rice, Cooked : Uncooked : Total
5 : 15 : 18

Total rice bought = 18 + 8 =26u
Total rice cooked = 5 + 5 = 10u

Fraction of rice cooked/bought = 10/26 => 5/13

Thank you so much, Ender! Minor correction...

The amount of rice cooked is equal for brown and white, we can common the cooked rice for them to share common unit.
White Rice, Cooked : Uncooked : Total
5 : 15 : 20

Fraction of rice cooked/bought = 10/28 => 5/14

Good spot... I have been making all these careless mistake all over the place recently...
Glad you can spot them, means you understanding.

[EC72]

anyway Ender for helping me to understand.

[Ender]

Khalid has two rectangular boxes of different sizes. The length, breadth and height of the larger box are twice those of the smaller box.

He packed 24 identical cubes exactly into the smaller box. How many such cubes can be packed exactly into the larger box?

Should be 8X 24 = 192

Visualise a 1 X 1 X 1 cube. You can put in 8 cube into a 2 X 2 X 2 box.

[EC72]

Khalid has two rectangular boxes of different sizes. The length, breadth and height of the larger box are twice those of the smaller box.

He packed 24 identical cubes exactly into the smaller box. How many such cubes can be packed exactly into the larger box?

Should be 8X 24 = 192

Visualise a 1 X 1 X 1 cube. You can put in 8 cube into a 2 X 2 X 2 box.

Ender!

[belnanna]

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

[Swift Formula]

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.

[belnanna]

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

[SOS mum]

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.

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.