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Thursday, July 20 2017 @ 03:39 PM CDT
 Forum Index >  Test Paper Related >  Primary 5 Matters
 Maths Questions 15
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By: shirley wee (offline)  Friday, June 29 2012 @ 06:48 AM CDT (Read 935 times)  
shirley wee

Hi everyone! I am stuck with this Maths Question. I would like your help to solve it and please show your workings clearly

Ali took 50 seconds to type 15 words. How long will he take tp type 900 words? Express your answer as a fraction of 1 hour.

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By: GIM (offline)  Friday, June 29 2012 @ 07:19 AM CDT  
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Solution:
15 words ------> 50seconds
900 words ----> 900/15 x 50 =3000seconds = 3000/(60 x 60) = 5/6 hour

Note : 1 hr = 60x60 =3600s

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By: shirley wee (offline)  Friday, June 29 2012 @ 07:40 AM CDT  
shirley wee

I also have the same answer as you too... But the answer sheet that my teacher gave me wrote '1/12' I am really confused until I have a headache. Cry Can you qualify again whether the answer has any mistakes, please? Frown Thank you very much Smile

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By: GIM (offline)  Friday, June 29 2012 @ 08:00 AM CDT  
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Unless there is an error in the question where it should be 90 words and not 900 words, then the answer will be 1/12.
90/15 x50 = 300s/3600 = 1/12hr

I can't see anything wrong with the solution of 5/6 hr. Check with your teacher tomorrow.

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