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By: chino (offline)  Friday, October 14 2011 @ 09:09 PM CDT (Read 2159 times)  

Mrs Jones bought 4/5 kg of meat.
She gave 1/5 kg of the meat to Mrs Singh and 2/5 kg of the meat to Mrs Smith.
(a) What fraction of the meat did she give away in all?
(b) What fraction of the meat did she have left?

My answer is

4/ 5kg = 800g
1/5 kg = 200g
2/5 kg = 400g

(a) 200 + 400 = 600
600/800 = 3/4

(b) 800-600 = 200
200 / 800 = 1/4

My answer did not agree with the model answer. model answer is 3/5 and 1/5.
Im v confused.
To me, 1/5 kg of the meat and 1/5 of the meat is NOT SAME right?
Please enlighten me. Thanks

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By: myluckystar111 (offline)  Saturday, October 15 2011 @ 02:05 AM CDT  


Mrs Jone bought 4/5 kg of meat

Show this by drawing a bar model represented by total of 4 units

So each unit is equivalent to 1/5 (not 1/5 kg)

(a) 1 unit to Mrs Singh + 2 units to Mrs Smith ---> 3 units which is 3/5 of the meat given away in total

(b) 1 unit left ---> 1/5 of the meat is left

Hope this helps. Big Grin

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Registered: 09/05/11
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By: Andrew Tham (offline)  Monday, May 20 2013 @ 02:56 AM CDT  
Andrew Tham

Chino is correct. The question asked what fraction of the meat is given away.

Even if you draw a model showing 4 parts, each part is 1/5 kg. Since 1/5kg (1 part) is given away to Mrs Singh and 2/5kg(2 parts) are given away to Mrs Smith, total parts given away is 3 parts. Fraction of meat given away is 3/4.

Similaryly, fraction of meat remaining is 1/4.

Question didn't ask how much (or what is the weight) given away or remaining.

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