Q&A - PSLE Math

[Robertpattinsonidle]

3. Two cars race around a circular track at constant speeds starting at the same point. If they travel in opposite direction, then they meet every 30 seconds. If they travel in the same direction, then they meet every 2 min. If the track is 1800m long, what is the speed of each car? ans: 22.7m/s and 37.5m/s.

[tianzhu]

Robertpattinsonidle:

3. Two cars race around a circular track at constant speeds starting at the same point. If they travel in opposite direction, then they meet every 30 seconds. If they travel in the same direction, then they meet every 2 min. If the track is 1800m long, what is the speed of each car? ans: 22.7m/s and 37.5m/s.

Hi

This question has been discussed on page 833.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&start=8320

Best wishes

[Shimmer]

Hi can someone help my dd ?


At a rugby match 1/4 of the spectators bought 1 pack of snack each. 3/5 of the remaining spectators bought 2 packs of snacks each. The remaining spectators bought 4 packs of snacks each. Given that all spectators bought 3854 pack of snacks , how many spectators ate there ?

[shell]

Dear Aunties/Uncles,

I'm using my mum's a/c. I need help with this Q. :gloomy: Amy ,Ben and Cathy were the top 3 scorers in a spelling competition. their teacher gave them a bag of marbles to share.Amy, the top scorer, received 2/3 bag of the marbles and 1/3of a marble, Ben, with the second highest score, received 2/3 of the remaining marbles and 1/3 of a marble. if there was only 1 marble left in the bag for Cathy, how many marbles were in the bag at first?

i would really appreciate it if any one of you could help me. i thank you in advance! :thankyou:

[kiasuursula]

shell:

Dear Aunties/Uncles,

I'm using my mum's a/c. I need help with this Q. :gloomy: Amy ,Ben and Cathy were the top 3 scorers in a spelling competition. their teacher gave them a bag of marbles to share.Amy, the top scorer, received 2/3 bag of the marbles and 1/3of a marble, Ben, with the second highest score, received 2/3 of the remaining marbles and 1/3 of a marble. if there was only 1 marble left in the bag for Cathy, how many marbles were in the bag at first?

i would really appreciate it if any one of you could help me. i thank you in advance! :thankyou:

Hi, i'm also using my mom's a/c. My ans is 13.
Not sure... ...

[MathIzzzFun]

Shimmer:

Hi can someone help my dd ?


At a rugby match 1/4 of the spectators bought 1 pack of snack each. 3/5 of the remaining spectators bought 2 packs of snacks each. The remaining spectators bought 4 packs of snacks each. Given that all spectators bought 3854 pack of snacks , how many spectators ate there ?

4 & 5-->LC M 20
for every group of 20 spectators,
5x1pack --> 5 packs
9x 2 packs --> 18 packs
6x4 packs --> 24 packs
total --> 47 packs
3854 ÷ 47=82 groups
total jumber of spectators --> 82x20=1640

cheers

[kiasuursula]

I need help with this question:


Candle A and Candle B are of the same length. Candle A, which is broader, can burn for 5h while Candle B, the thinner candle, can burn for 4h. If both candles are lighted at the same time, how long does it take for Candle A to be twice as long left as Candle B?
:thankyou:

[2DMommy]

Please help me with these two questions :


1) Jay bought some chocolates and gave half of it to Kay. Kay bought some sweets and gave half of it to Jay. Jay ate 12 sweets and Kay ate 18 chocolates and then the ratio of Jay’s sweets to chocolates became 1:7 and the ratio of Kay’s sweets to chocolates became 1:4. How many sweets did Jay have at first ?

2)There are more pupils in School A then School B. 30% of the pupils in School A is 45 more than 40% of the pupils in School B. If 10% of the pupils in School A leaves to join School B, there will be 200 more pupils in School A than School B. How many pupils are there in School B?

Thank you !

[tianzhu]

shell:

Dear Aunties/Uncles,

I'm using my mum's a/c. I need help with this Q. :gloomy: Amy ,Ben and Cathy were the top 3 scorers in a spelling competition. their teacher gave them a bag of marbles to share.Amy, the top scorer, received 2/3 bag of the marbles and 1/3of a marble, Ben, with the second highest score, received 2/3 of the remaining marbles and 1/3 of a marble. if there was only 1 marble left in the bag for Cathy, how many marbles were in the bag at first?

i would really appreciate it if any one of you could help me. i thank you in advance! :thankyou:

Hi

I think it should be read as \" 2/3 of the remaining bag of marbles'.

Your question is similar to this question which has been discussed earlier.

The solution to your question.

1 unit ----- 4/3

3 units ------ 4

1 part ------ 13/3

3 parts ------ 13

Hope this helps.

Best wishes

http://farm5.staticflickr.com/4019/4713599224_8f586290c0_z.jpg\">

[tianzhu]

kiasuursula:

I need help with this question:


Candle A and Candle B are of the same length. Candle A, which is broader, can burn for 5h while Candle B, the thinner candle, can burn for 4h. If both candles are lighted at the same time, how long does it take for Candle A to be twice as long left as Candle B?
:thankyou:

Hi

Please go to page 551.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&p=740265

Best wishes