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Josephine had a total of 540 Singapore and Malaysian stamps in the ratio 11:7. After she had given away an equal number of each type of stamps, the number of Singapore and Malaysia stamps left was in the ratio 7:1. How many Singapore stamps did she give away?

MaiaMitchell  Oct 3, 2015

Best Answer 

 #1
avatar+92623 
+5

Josephine had a total of 540 Singapore and Malaysian stamps in the ratio 11:7. After she had given away an equal number of each type of stamps, the number of Singapore and Malaysia stamps left was in the ratio 7:1. How many Singapore stamps did she give away?

 

If you are up for it Maia I will work with you to solve this.  

Please other people do not jump in and give Maia the answer to this.  

She has told me that she want to learn and not just copy so this is a bit of a test. (You can answer her other questions if you want to although it would be good if you so not give her the whole answer all at once.)

 

---------------------------------------

Lets look at the first sentence.

Josephine had a total of 540 Singapore and Malaysian stamps in the ratio 11:7

 

This means that Josephine could seperate her Singapore and Malaysian stamps into two sperate piles.  She could then split her Singapore stamps into 11 separate piles and she could split her Malaysian stamps into 7 piles.  NOW each pile has exactly the same number of stamps.  Altogether there are 11+7=18 equal piles of stamps in front of her.

How many stamps are in each pile?  How did you get your answer?

Now.

How many of the stamps are Singapore ones and how many are Malaysian ones?  Show working.

 

Now it is time to interact with me Maia.  :))

Melody  Oct 3, 2015
 #1
avatar+92623 
+5
Best Answer

Josephine had a total of 540 Singapore and Malaysian stamps in the ratio 11:7. After she had given away an equal number of each type of stamps, the number of Singapore and Malaysia stamps left was in the ratio 7:1. How many Singapore stamps did she give away?

 

If you are up for it Maia I will work with you to solve this.  

Please other people do not jump in and give Maia the answer to this.  

She has told me that she want to learn and not just copy so this is a bit of a test. (You can answer her other questions if you want to although it would be good if you so not give her the whole answer all at once.)

 

---------------------------------------

Lets look at the first sentence.

Josephine had a total of 540 Singapore and Malaysian stamps in the ratio 11:7

 

This means that Josephine could seperate her Singapore and Malaysian stamps into two sperate piles.  She could then split her Singapore stamps into 11 separate piles and she could split her Malaysian stamps into 7 piles.  NOW each pile has exactly the same number of stamps.  Altogether there are 11+7=18 equal piles of stamps in front of her.

How many stamps are in each pile?  How did you get your answer?

Now.

How many of the stamps are Singapore ones and how many are Malaysian ones?  Show working.

 

Now it is time to interact with me Maia.  :))

Melody  Oct 3, 2015
 #2
avatar+86859 
+5

Josephine had a total of 540 Singapore and Malaysian stamps in the ratio 11:7. After she had given away an equal number of each type of stamps, the number of Singapore and Malaysia stamps left was in the ratio 7:1. How many Singapore stamps did she give away?

 

Let x be the original number of Singapore stamps and 540 - x  be the original number of Malaysian stamps....and we're told that

 

x / [540 - x]  = 11/7    cross-multiply

 

7x = 11[540 - x]  simplify

 

7x = 5940 - 11x    add 11x to both sides

 

18x = 5940     divide both sides by 18

 

x = 330........this is the original number of Singapore stamps

 

And 540 - 330  =  210  = the original number of Malaysian stamps

 

Let n be the number of each that she gave away.....and we're told that........

 

[330 - n] / [210 - n] =  7/1       cross-multiply, again

 

330 - n = 7[210 - n]   simplify

 

330 - n = 1470 - 7n

 

6n = 1140   divide both sides by 6

 

n = 190  = the number of Singapore [and Malaysian] stamps she gave away

 

 

cool cool cool

CPhill  Oct 4, 2015

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