Q&A - PSLE Math

[MathIzzzFun]

ozora:

need help in this question.

The ratio of Alice's savings to Cat's savings was 1:3.
They shared the cost of a present in the ratio of 2:5.
Alice used 1/3 of her savings while Cat had $57 left after buying the present.
How much was the present?

Hi

could you check the question - should $57 be $52 ?

MD to solve this problem sum...

http://i55.tinypic.com/2ls8tci.jpg\">

cheers.

[tianzhu]

htn:

May I know what are the answers for this q?
TIA

Hi

The answers are a) 116 cm and b) 364.42 cm

Best wishes

[htn]

tianzhu:

htn:

May I know what are the answers for this q?
TIA

Hi

The answers are a) 116 cm and b) 364.42 cm

Best wishes

tianzhu

can teach u how to do?

TIA

[tianzhu]

htn:

can teach u how to do?

Hi

I have used different colours to differentiate the semicircles, hope this help.

Best wishes

http://farm7.static.flickr.com/6063/6030981441_d6317d4bf6_z.jpg\">

[tianzhu]

gijg:

Last night , 30 passengers travelled on a 27 seater coach ( not including driver) from singapore to kl . They took turns to occupy the seats on the 5hour long journey. All of them stood exactly the same duration . How long did each passenger stand .

Hi

Total amount of “sitting time” ---- 27*5 ----- 135

“sitting time” per passenger ----- 135/30 ----- 4.5

“standing time” per passenger ----- 5 - 4.5 ----- 0.5

Hope this helps.

Best wishes

[Andrew Lee]

tianzhu:

gijg:

Last night , 30 passengers travelled on a 27 seater coach ( not including driver) from singapore to kl . They took turns to occupy the seats on the 5hour long journey. All of them stood exactly the same duration . How long did each passenger stand .

Hi

Total amount of “sitting time” ---- 27*5 ----- 135

“sitting time” per passenger ----- 135/30 ----- 4.5

“standing time” per passenger ----- 5 - 4.5 ----- 0.5

Hope this helps.

Best wishes

Hi, can help me solve this question?
Joamme & tomomi bought the same bag from the same shop when they went shopping together. joanne spent 75% of her money on the bag & tomoni spent 2/3 of hers. What % of their total sum of money was the cost of a bag if the girls had $100 left together? (round off to nearest tenth). Thank :love:

[ozora]

MathIzzzFun:

ozora:

need help in this question.

The ratio of Alice's savings to Cat's savings was 1:3.
They shared the cost of a present in the ratio of 2:5.
Alice used 1/3 of her savings while Cat had $57 left after buying the present.
How much was the present?

Hi

could you check the question - should $57 be $52 ?

MD to solve this problem sum...

http://i55.tinypic.com/2ls8tci.jpg\">

cheers.

is $57. the given answer is 266.
why is that 3 units are cut into 18 units?

[MathIzzzFun]

ozora:

MathIzzzFun:

[quote=\"ozora\"]need help in this question.

The ratio of Alice's savings to Cat's savings was 1:3.
They shared the cost of a present in the ratio of 2:5.
Alice used 1/3 of her savings while Cat had $57 left after buying the present.
How much was the present?

Hi

could you check the question - should $57 be $52 ?

MD to solve this problem sum...

http://i55.tinypic.com/2ls8tci.jpg\">

cheers.

is $57. the given answer is 266.
why is that 3 units are cut into 18 units?[/quote]Hi

Given answer is incorrect.
If amount spent on present is $266 :
Alice's share = 2/7 x $266 = $76, Alice had $76 x 3 = $228 at first.
Cat's share = 5/7 x $ 266 = $190, Cat had $190 + $57 = $247 at first.

Alice's savings : Cat's savings = 228 : 247, not 1:3

http://i55.tinypic.com/qpjf9x.jpg\">

cheers.

[tianzhu]

Andrew Lee:

Hi, can help me solve this question?
Joamme & tomomi bought the same bag from the same shop when they went shopping together. joanne spent 75% of her money on the bag & tomoni spent 2/3 of hers. What % of their total sum of money was the cost of a bag if the girls had $100 left together? (round off to nearest tenth). Thank :love:

Hi

A quick one, I don’t have the time to draw the MD now.

Since we are talking about the same bag, J and T spend the same amount of money each.

Using “Equal Concept”

Joamme ----- 6 units (spent), 2 units (left)
Tomomi ------6 units (spent), 3 units (left)

5 units ----- 100
1 unit ---- 20

A bag ----- 6*20 ----- 120
Total amount of money ----- 17*20 ----- 340

120/340*100% ------ 35.3%

Hope this helps.

Best wishes

[Dreamerz]

Hi can anyone help me with this question?


Lillian had 600 beads and 35% of them were blue.Meena had 400 beads, 45% of them were blue. After giving some of their beads to each other, 25% of Lillian's beads and 50% of Meena's beads were blue beads.
a) how many beads did Lillian have in the end?
b) how many blue beads did Meena receive from Lillian?

Thank you