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Monday, May 29 2017 @ 06:24 AM CDT
 Forum Index >  Test Paper Related >  Primary 5 Matters
 P5 Maths (percentage)
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By: JessicaTan (offline)  Saturday, July 28 2012 @ 06:28 AM CDT (Read 711 times)  
JessicaTan

Please help.

Raj wants to buy a book but he only has 35% of the money. After his mother has given him $18, he is still short of 1/4 of the money. What is the price of the book?


Thanks
Jessica Tan

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Posts: 82

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By: echeewh (offline)  Saturday, July 28 2012 @ 08:31 AM CDT  
echeewh

Hey Jessica,

Following pls find my worked solution:

35% = 35/100 = (7/20)

This means the price of the book --> 20u, of which Raj has only 7u.

Next, Raj was given $18, and is still short of of (1/4).

(1/4) x 20u = 5u.

Hence we have the following model:

** - buffer space for alignment purpose

B |-----------------------------------------|
**<----7u----><----$18---><--5u--->
**<------------------20u---------------->

20u - 12u --> 18
8u --> 18
1u --> (18/8)

Price of Book = 20u --> 20 x (18/8) = $45

========================

Trust this helps.

Do let me know again if this does not match your answerkey or if you have any clarification.

Cheers,
Edward

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By: JessicaTan (offline)  Saturday, July 28 2012 @ 11:19 PM CDT  
JessicaTan

Quote by: echeewh

Hey Jessica,

Following pls find my worked solution:

35% = 35/100 = (7/20)

This means the price of the book --> 20u, of which Raj has only 7u.

Next, Raj was given $18, and is still short of of (1/4).

(1/4) x 20u = 5u.

Hence we have the following model:

** - buffer space for alignment purpose

B |-----------------------------------------|
**<----7u----><----$18---><--5u--->
**<------------------20u---------------->

20u - 12u --> 18
8u --> 18
1u --> (18/8)

Price of Book = 20u --> 20 x (18/8) = $45

========================

Trust this helps.

Do let me know again if this does not match your answerkey or if you have any clarification.

Cheers,
Edward




Hi Edward,

Thanks for your working solution. Answer is correct. Smile

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Registered: 10/17/09
Posts: 82

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