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 Need help for Nan Hua 2010 SA2 maths Q18
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By: angieneo (offline)  Wednesday, October 19 2011 @ 02:30 AM CDT (Read 1422 times)  
angieneo

A Piggy bank has a total of 2562 coins consisting of one dollar coins, fifty cent and twenty cent coins
3/7 of the one dollar coins and 32 of the fifty cent coins are taken out
20 more twenty cent coins are put in
After that , there is an equal number of one dollar , fifty cent and twenty cent coins in the piggy baby
How many of each type of coins are there in the piggy bank at first?

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By: myluckystar111 (offline)  Wednesday, October 19 2011 @ 06:14 AM CDT  
myluckystar111

Hey

Draw bar models as follows:

$1 coins --> 7 units
Shade 3 units to show as taken out
Therefore left only 4 units.

50 cent coins --> Remaining will also be 4 units (same as above) + 32 coins which were taken out
20 cent coins --> Remaining also 4 units (this includes 20 coins which were added in to the original quantity)

7 units + 4 units + 4 units + 32 - 20 = 2562
15 units = 2550
1 unit = 170

$1 coin --> 7 x 170 = 1,190
50 cent coins --> (4 x 170) + 32 = 680 + 32 = 712
20 cent coins --> (4 x 170) - 20 = 680 - 20 = 660

Hope this helps. Big Grin

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By: angieneo (offline)  Wednesday, October 19 2011 @ 08:12 PM CDT  
angieneo

thank you very much

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