In a bag of notes, the number of $2, $5 and $10-notes are in ratio of 22 : 7 : 3. 5/11 of the $2-notes and 71 of $5-notes are taken out. The remaining notes are worth $624. How many $10-notes are there?
Original number of $2 is 22 units. So convert the remaining fraction in order to compare to 22 units.
5/11 x 2/2 = 10/22
Convert the 71 $5 notes to amount.
71 x 5 = $355
$2 $5 $10 Total
-----------------------------------------
22 : 7 : 3
- 10 -$355
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12 : 7 - $355 : 3
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24 35 - $355 30 $624 Convert number of notes
------------------------------------------ to amount.
24 + 35 + 30 = 89
89 u --> 624 + 355 = 979
1 u --> 979 ÷ 89 = 11
3 u --> 3 x 11 = 33
If you are worried that marks may be deducted, you can always find 30 u to get $330. Then divide by 10 to get 33 $10 notes.
There are 33 $10 notes.
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