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 Forum Index >  Test Paper Related >  Primary 4 Matters
 Need help on Problem sum
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By: shin (offline)  Wednesday, October 20 2010 @ 07:05 AM CDT (Read 1618 times)  
shin

Hi,

Appreciate someone can help me on the below 3 qtns

1) A Kettle has 420ml more water than a jug.
When 150ml of water is poured from the jug into the kettle, there are 4 times as much water in the kettle as the jug.
How much water is there in the jug now ?

the ans is 240ml but i cannot get this ans. My ans is 190ml


2) Jane loved eating sweets. Each day, she would eat 2 more sweet than the previous day.
If she ate total of 27 sweets in 3 days, how many such sweets did she start with on the first day ? Ans is 7 sweets


3) Alvin, Belinda and Candy had $900 altogether. Alvin spent 1/2 of his money,
Belinda spent $60 and Candy spent 3 times the amount Alvin spent. If they had the same amount of money left,
how much did Alvin have at first ? Ans is $240

Thanks in advance .

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By: veronica2566 (offline)  Wednesday, October 20 2010 @ 10:48 AM CDT  
veronica2566

See attachment for answers.

Hope you are able to understand. Smile

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By: shin (offline)  Thursday, October 21 2010 @ 12:39 AM CDT  
shin

Quote by: veronica2566

See attachment for answers.

Hope you are able to understand. Smile



Hi Veronica,

I think u have miss out the attachment

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By: veronica2566 (offline)  Thursday, October 21 2010 @ 01:46 AM CDT  
veronica2566

I did attach the file, or so I thot! How do I do the attachment? Can't understand the instructions.

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By: suz855 (offline)  Thursday, October 21 2010 @ 01:52 AM CDT  
suz855

1) A Kettle has 420ml more water than a jug.
When 150ml of water is poured from the jug into the kettle, there are 4 times as much water in the kettle as the jug.
How much water is there in the jug now ?

the ans is 240ml but i cannot get this ans. My ans is 190ml

Before
Kettle --> 1u+420
jug -->1u

After
kettle--> 1u + 420 + 150 ---> replace 1u as 1part + 150 + 420 +150 = 4parts **
jug --> 1u - 150 -->1 part

3 parts = 720
1part = 240ml



2) Jane loved eating sweets. Each day, she would eat 2 more sweet than the previous day.
If she ate total of 27 sweets in 3 days, how many such sweets did she start with on the first day ? Ans is 7 sweets

Day 1 --> 1u
Day 2 --> 1u+2
Day 3 --> 1u + 4

3u + 6 = 27, 3u = 21, therefore, 1u=7


3) Alvin, Belinda and Candy had $900 altogether. Alvin spent 1/2 of his money,
Belinda spent $60 and Candy spent 3 times the amount Alvin spent. If they had the same amount of money left,
how much did Alvin have at first ? Ans is $240

At first
Alvin --> 2u (1u left, 1u spent)
Belinda --> 1u+60 (1u left, 60 spent)
Candy --> 4u (1u left, 3u spent)

7u + 60 = 900, 7u=840, 1u=120
Alvin 2u at first thus 2x120 = $240
Big Grin

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By: veronica2566 (offline)  Thursday, October 21 2010 @ 02:02 AM CDT  
veronica2566

Got it. Mine is similar but with model answers.

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By: shin (offline)  Friday, October 22 2010 @ 02:25 AM CDT  
shin

Thanks Veronica and Suz855 for your explaination and model. Really appreciated Big Grin

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By: sethchew (offline)  Friday, October 22 2010 @ 09:07 PM CDT  
sethchew

Quote by: shin

Hi,

Appreciate someone can help me on the below 3 qtns

1) A Kettle has 420ml more water than a jug.
When 150ml of water is poured from the jug into the kettle, there are 4 times as much water in the kettle as the jug.
How much water is there in the jug now ?

the ans is 240ml but i cannot get this ans. My ans is 190ml


2) Jane loved eating sweets. Each day, she would eat 2 more sweet than the previous day.
If she ate total of 27 sweets in 3 days, how many such sweets did she start with on the first day ? Ans is 7 sweets


3) Alvin, Belinda and Candy had $900 altogether. Alvin spent 1/2 of his money,
Belinda spent $60 and Candy spent 3 times the amount Alvin spent. If they had the same amount of money left,
how much did Alvin have at first ? Ans is $240

Thanks in advance .


150 x 2 = 300
300 + 420 = 720
720/3 = 240 240 is the ans

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