Tutor MathsGuru: Ask me for your burning Maths questions!

[maths6a]

Carrot:

hi

tough question here pleasee help

john shifted the decimal point onumber twice to the left to obtain a new number. the difference between thr new number and the original number was 136.62
a) How many times of the new number is the original number?
b) What is the sum of the 2 numbers ?

To better understand this question, take 100 as the original number. When you move its decimal place to the left 2 places, the number becomes 1.
so the original number is 100 units and the new number will be 1 unit.
The sum between the 2 numbers will be 101 units and the difference between them will be 99 units.

a) the new number is 100 times the new number.

99 units --- 136.62
101 units --- 101 x 136.62 /99
= 139.38

[tianzhu]

maths6a:

99 units --- 136.62
101 units --- 101 x 136.62 /99
= 139.38

H maths6a
Good Morning

139.38 – 1.3938 is not equal to 136.62 (the difference between the new number and the original number was 136.62 )

A logical answer is 138

138 -1.38 gives you 136.62

Best wishes

[Tang]

tianzhu:

maths6a:

99 units --- 136.62
101 units --- 101 x 136.62 /99
= 139.38

H maths6a
Good Morning

139.38 – 1.3938 is not equal to 136.62 (the difference between the new number and the original number was 136.62 )

A logical answer is 138

138 -1.38 gives you 136.62

Best wishes

Hi,

Maths6a's answers are correct.

139.38 is the sum of the 2 numbers --- that is 101 units
and not the original number or 100 units.

[tianzhu]

Tang:

Hi,
Maths6a's answers are correct.
139.38 is the sum of the 2 numbers --- that is 101 units
and not the original number or 100 units.

Hi Tang
Good Morning

Yes, the correct answer is 139.38.

I am sorry for the mistake.

Best wishes

[tianzhu]

Almighty:

Hi Tianzhu,
I had worded exactly as how it was in my source. Sorry to reply late.Just saw yr quote.
Thankyou Dharma n tianzhu 4 the g8t help...

Hi Almighty
Good Morning

No worries.
Enjoy your PSLE journey.

Best wishes

[Vanilla Cake]

Carrot:

hi

tough question here pleasee help

john shifted the decimal point onumber twice to the left to obtain a new number. the difference between thr new number and the original number was 136.62
a) How many times of the new number is the original number?
b) What is the sum of the 2 numbers ? :scratchhead: :stupid:

This is a http://road-to-psle.blogspot.com/2010/08/rgs-primary-2009-psle-math-prelim-paper_3183.html set on 26 August 2009.
It's good to state the source and level of the question posted as well as the given answer to help potential problem solvers in one way or another.

[Carrot]

tianzhu:

Tang:

Hi,
Maths6a's answers are correct.
139.38 is the sum of the 2 numbers --- that is 101 units
and not the original number or 100 units.

Hi Tang
Good Morning

Yes, the correct answer is 139.38.

I am sorry for the mistake.

Best wishes

err hi guys , Pardon if you can repharse your working and give me your answer.How you get yr 138??? :? :?

[tianzhu]

Carrot:

err hi guys , Pardon if you can repharse your working and give me your answer.How you get yr 138??? :? :?

Hi

Please ignore my earlier post; I misread the question as asking for the original number.

The question asks for the sum of the original and new number.

The original number is 138.
The new number is 1.38
Therefore the sum of two numbers is 139.38.

Best wishes

[Carrot]

tianzhu:

Carrot:

err hi guys , Pardon if you can repharse your working and give me your answer.How you get yr 138??? :? :?

Hi

Please ignore my earlier post; I misread the question as asking for the original number.

The question asks for the sum of the original and new number.

The original number is 138.
The new number is 1.38
Therefore the sum of two numbers is 139.38.

Best wishes

Thanks for all help :celebrate:

[Herbie]

I have 2 qns,


a. For every $2 that Edyy spent, Fred spent $3. After Eddy had spent all his money. Fred still had 3/8 of the total amount of the two boys had at first.

What fraction of the total amount of money did Eddy have at first?
What was the ratio of Fred’s money to Eddy’s money at first?

b. Mr Lee Left Town M and travelled towards Town N at an average speed of 80km/h. An hour later, mr ong left Town M and travelled towards Town N at an average speed of 100km/h. mr Ong passed Town Q which was halfway between Town M and Town N 30 minutes earlier than Mr Lee. If Mr Ng reached Town N at 10pm, at what time did Mr Lee leave Town M for Town N?


TIA.