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 Aitong Maths SA2 P5 Paper 2 Q15
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By: JezebelTan (offline)  Monday, October 22 2012 @ 03:32 AM CDT (Read 773 times)  
JezebelTan

Q15 Henry has some 10-cent, 20-cent and 50-cent coins. The ratio of the number of 10-cent coins to the number of 20-cent coins is 7:2. The number of 50-cent coins 1/2 the number of 20-cent coins. The total value of the 10-cent coins is $16 more than the total value of 50-cent coins. How much does Henry have altogether?

Need help urgently!
Appreciate if you can help me to solve this! Big Grin

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By: echeewh (offline)  Monday, October 22 2012 @ 04:46 AM CDT  
echeewh

hi jezebel,

This is a typical question making use of <Number × Value> method.

Following pls find my worked solution.


<Number ratio>
10¢ : 20¢ : 50¢
7 : 2 : 1

(7u × 10) - (1u × 50) --> 1600
70u - 50u --> 1600
20u --> 1600
1u --> 80

Number of 10¢:
7u --> 7 × 80 = 560
Value of 10¢:
560 × 10 = $56.00

Number of 20¢:
2u --> 2 × 80 = 160
Value of 20¢:
160 × 20 = $32.00

Number of 50¢:
1u --> 80
Value of 50¢:
80 × 50 = $40.00

Total value = $56.00 + $32.00 + $40.00 = $128.00

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

Trust this helps.

Do let me know again if there's further clarification.

Good luck & all the best,
Edward

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By: JezebelTan (offline)  Monday, October 22 2012 @ 04:54 AM CDT  
JezebelTan

Thanks alot!! Big Grin

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