Question

I have a set of 19 notes, all $5 or $20, worth $215 in total. of these notes, nine are in my wallet. what is the possible range for the amount of money in my wallet

Answer 1

From $45 to $180 in your wallet

Answer 2

The total number of notes in the wallet is 9 .

And all of them are either of $5 or of $20 .

So if they all are of $5, then total amount in the wallet is $5*9=$45.

And if all of them are of $ 20, then total amount is $20*9 = $180 .

So the amount can be either $ 45 or $ 180 .