Q&A - PSLE Math

[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.

[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.

[balu_priya]

MathIzzzFun:

balu_priya:

My friend who is too shy to post asked me to help her to post on ksp.

Would appreciate help on the following questions:



2. Father has given Claire and Jane each a certain amount money to spend . If Claire spends $30 each day and Jane spends$20each dayclaire would have $100 left by the time. Jane spends all her money if Claire spends $ 20each day and Jane spends $ 30 each day Claire would have $ 600 left by the time Jane spends all her money . Find the total amount of money given to Claire?

here are 4 approaches to solve such questions -

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http://i46.tinypic.com/ejvktd.png\">

cheers.

:thankyou:

[aps]

Hi MathIzzzFun

Thanks for the link!

[balu_priya]

MathIzzzFun:

balu_priya:

My friend who is too shy to post asked me to help her to post on ksp.

Would appreciate help on the following questions:

1.Sam is 5times as old as his sister. iN 10 yrs time Sam will be 12 yrss less than thrice his sisters age then. How much older is Sam than his sister?

Age now,
Sam's sister --> 1 unit
Sam --> 5 units

10 years' time,
Sam's sister --> 1 unit + 10 -- \"thrice\" --> 3 units + 30
Sam --> 5 units + 10

Sam is 12 years less than his sister:
5 units+ 10+12 = 3 units + 30
1 unit --> 4

4 units --> 16

Sam is 16 years older than his sister.

cheers.

:thankyou:

[Michaelia0816]

Tianzhu,

Pls help,

1)Each of the three cards shown below is printed with a different whole number.
The biggest number is 42. When these number are added two at a time, the sums are 57,64 and 77. What are the other 2 numbers?

2) A forty- page newspaper, which consists of only one section, has a sheet with page 9 and page 10 missing. What other pages are missing?

Pls done it by today as I am going to have math prelim the next day~.~

[MathIzzzFun]

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.

Q1.
Total -> 70 units
C+D -> 49 units
B --> 70 unit s- 49 units = 21 units

B+D -> 60 units
C --> 70 units – 60 units = 10 units
D --> 60 units – 21 units = 39 units

B --> 21 units, C --> 10 units, D --> 39 units
B+C --> 31 units = 620
1 unit --> 20
39 units – 21 units = 18 units
18 x 20 = 360

Denise collected 360 stickers more than Belle.


Q2.
Ratio of speed at 80 km/h : 60 km/h = 4 : 3
Ratio of time taken to travel same distance at 80 km/h : 60 km/h = 3u : 4u

¾ h – ⅓ h = 5/12 h = 25 min -> travelling at 80km/h is 25 min faster than travelling same distance at 60 km/h

1u -> 25 min, total time taken at 60 km/h
--> 4 x 25 min = 100 min = 2 ⅔ h
Total time taken at 90 km/h = 60/90 x 2 ⅔ h = 10/9 h = 1¹∕₉ h

cheers.

[tianzhu]

Michaelia0816:

Tianzhu,

Pls help,

1)Each of the three cards shown below is printed with a different whole number.
The biggest number is 42. When these number are added two at a time, the sums are 57,64 and 77. What are the other 2 numbers?

Hi

Hope this helps.

Best wishes

http://farm9.staticflickr.com/8440/7836643020_0af55760ca_z.jpg\">