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Question

Raina saves her allowance by putting a note into her money box each week. Each note was either a $2 note or a $5 note. Her father also puts in a $10 note every 30 days. The total amount she collected after 365 days was $278. How many of the notes were $5 notes?

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Answer

No of $10 notes -> (365/30) 12
Amount -> $120

$278 – $120 -> $158

Assume all $2notes,

52 * 2 -> 104

158 – 104 -> 54

54/3 -> 18 ($5 notes)

There were 18 $5 notes.

1 Reply 0 Likes ✔Accepted Answer

Thanks nicnac, do you know why the last part that you need to divide by 3 which gives you $18 ($5 notes)?

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lynn01sg wrote:Thanks nicnac, do you know why the last part that you need to divide by 3 which gives you $18 ($5 notes)?

This method is call supposition or make a supposition or assumption . Google the bolded keyword, there are many article and youtube examples.
Once you study it you’ll understand why we use the difference.

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lynn01sg wrote:Thanks nicnac, do you know why the last part that you need to divide by 3 which gives you $18 ($5 notes)?

Difference: $5 – $2 -> $3

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