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primary 6 | Maths
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Date Posted: 4 years ago
Views: 219
Ratio of $2 to $5 notes
= 3 : 10
Since there are 30 $2 notes at first,
Number of $5 notes at first
= 30 ÷ 3 x 10
= 100
(Alternative working :
3 : 10 = 30 : 100
So there are 100 $5 notes at first)
Difference in the number of notes = 100 notes - 30 notes
= 70 notes
Since an equal number of each type of note was spent, the difference remains the same at 70 notes.
Now the ratio is 5 : 19
Difference = 19units - 5units = 14 units
70notes ÷ 14 units = 5notes/unit
So 1 unit represents 5 notes.
Multiply by 5, 5 : 19 = 25 : 95
Initial ratio is 30 : 100
30 - 25 = 5
100 - 95 = 5
This means 5 $2 and 5 $5 notes were spent.
You can finish up the question from here.
= 3 : 10
Since there are 30 $2 notes at first,
Number of $5 notes at first
= 30 ÷ 3 x 10
= 100
(Alternative working :
3 : 10 = 30 : 100
So there are 100 $5 notes at first)
Difference in the number of notes = 100 notes - 30 notes
= 70 notes
Since an equal number of each type of note was spent, the difference remains the same at 70 notes.
Now the ratio is 5 : 19
Difference = 19units - 5units = 14 units
70notes ÷ 14 units = 5notes/unit
So 1 unit represents 5 notes.
Multiply by 5, 5 : 19 = 25 : 95
Initial ratio is 30 : 100
30 - 25 = 5
100 - 95 = 5
This means 5 $2 and 5 $5 notes were spent.
You can finish up the question from here.
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