Q&A - PSLE Math

[catddy2002]

Hi,


Pls help to solve these 2 questions:

1) At a party, there were some balloons, 40 balloons burst and 25% of the remaining ballons flew away. If only 2/3 of the balloons were left, how many balloons were there at first?

2) Jarmanye planned to cycle from Town A to Town B. If she cycled at 20km/h, she would reach Town B at 2 pm. If she cycled at 12 km/h, she would reached Town b at 3.30 pm. What was the distance between Town A and Town B?



Hi,

Pls assist in solving these 2 questions.
Thanks

Thanks

[oosh]

mujin:

oosh:

Hi,


Pls help to solve this question:

Jimmy and Tony drove 45Km from the library to the swimming pool. Tony started his journey 24mins later than Jimmy. Both of them reached the swimming pool at the same time. If Jimmy's average speed was 50km/h, find Tony's average speed (Ans: 90Km/h)

TIA

Jimmy : 50km/h = 50km/60min
45/50x60min = 54 min (jimmy travelled for 54 min)

Tony travelled for 54-24 min = 30 min

45km/30min = 45km/0.5h = 90km/h

HI,

Thanks so much. :grphug:

[oosh]

oosh:

Hi,


Needed some help on this question.

Jimmy runs 4km/h faster than he walks. He walks 1 1/2hr and runs the rest of the time over a distance of 6Km. If Jimmy walks as fas as he runs, find the amount of time he spends running.

Answer given = 1/2hr but my answer is 3/4hr. Will greatly appreciate any assistance.

Hi, appreciate any help :thankyou:

[atutor2001]

oosh:

oosh:

Hi,


Needed some help on this question.

Jimmy runs 4km/h faster than he walks. He walks 1 1/2hr and runs the rest of the time over a distance of 6Km. If Jimmy walks as far as he runs, find the amount of time he spends running.

Answer given = 1/2hr but my answer is 3/4hr. Will greatly appreciate any assistance.

Hi, appreciate any help :thankyou:

This is more like a test of English.

You have interpreted the sentence in red as \"distance which he ran = 6km\".

They have interpreted the sentence in red as \"Total distance = 6km\" i.e. distance which he ran = 3km.\"

I would pick your way of interpretation.

[jonaandr]

please help to solve the below 2 questions.


1. There were some balls in Boxes A,B and C. For every 3 balls in Box A, there were 7 balls in Box. For every 5 balls in Box B, there were 6 balls in Box C. After 48 balls were transferred from Box C to Box A, the ratio of the number of balls in Box A to the number of ball in Box B to the number of balls in Box C became 19:35:38. Find the total number of balls in the three boxes.

2. A motorcyclist travelle from Town A to Town B. It passed a taxi travelling from Town B to Town A. The taxi was traveling at a speed of 90 km/h. The motorcyclist reached Town B 1 1/2 hours after passing the taxi but the taxi was still 25 km away from Twon A. Both the motorcyclist and the taxi did not change their speeds throughout their journeys. If the motorcyclist took 4 hours to complete the shole journey, what was the distance between the two towns?

Thanks!

[aps]

Hi MathIzzFun


Thanks for helping to solve the question. I appreciate. :salute:

[oosh]

atutor2001:

oosh:

[quote=\"oosh\"]Hi,


Needed some help on this question.

Jimmy runs 4km/h faster than he walks. He walks 1 1/2hr and runs the rest of the time over a distance of 6Km. If Jimmy walks as far as he runs, find the amount of time he spends running.

Answer given = 1/2hr but my answer is 3/4hr. Will greatly appreciate any assistance.

Hi, appreciate any help :thankyou:

This is more like a test of English.

You have interpreted the sentence in red as \"distance which he ran = 6km\".

They have interpreted the sentence in red as \"Total distance = 6km\" i.e. distance which he ran = 3km.\"

I would pick your way of interpretation.[/quote]Hi,

Thanks for your help

:thankyou:

[aps]

Hi

Please help to solve this question. Thanks in advance.

Leon bought some terrapins and guppies for a total of $96. He bought 3 times as many guppies as terrapins. He paid $30 more for the terrapins than for the guppies. Each terrapin cost $10.40 more than each guppy.

(a)How many terrapins did he buy?

(b)What was the cost of each guppy?

[MathIzzzFun]

aps:

Hi

Please help to solve this question. Thanks in advance.

Leon bought some terrapins and guppies for a total of $96. He bought 3 times as many guppies as terrapins. He paid $30 more for the terrapins than for the guppies. Each terrapin cost $10.40 more than each guppy.

(a)How many terrapins did he buy?

(b)What was the cost of each guppy?

This question was discussed - http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&p=755281&hilit=guppies#p755281

It would be good if you could do a quick search for keyword to see if the question was discussed previously, in this thread.

cheers.

[Petkwang]

Belle, Cathy and Denise had a collection of stickers. Cathy and Denise collected 7/10 of the stickers, Belle and Denise collected 6/7 of the stickers, Belle and Cathy collected 620 stickers altogehter. How many more stickers did Denise collected than Belle? Answer 360 stickers




Lily is meeting a friend at a certain time. If she drive 80km/h she will be 1/3 hr late. If she drive at 60km/h, she will be 3/4 hr late. How long will be the journey take if she drive at 90km/h? Answer 1 1/9 hr

Thank you in advance.