Rio, Hal and Ben had the same number of notes. Rio and Hal had a mix of $100-notes and $20-notes. Hal had 7 $100-notes while Rio had 13 $100-notes. Ben only had $100-notes.

1. Who had the least amount of money?
2. How much less did Hal have than Rio?
3. Rio used all his $20-notes to buy a wallet. He then had $2100 less than Ben. How many $100-notes did Ben have?

(a)
The three boys had the same number of notes.
$100-notes have a higher denomination than $20-notes.

Since Hal had the least number of $100-notes, he had the least money.

(b)
Number of less $100-notes that Hal had than Rio
= 13 - 7
= 6

Difference in the value of $100-note and $20-note
= 100 - 20
= $80

Amount that Hal had less than Rio
= 6 x 80
= $480

(c)
Value of $100-notes that Rio had left
= 13 x 100
= $1300

Total value that Ben had
= 1300 + 2100
= $3400

Number of $100-notes that Ben had
= 3400 ÷ 100
= 34

Answer(s): (a) Hal; (b) $480; (c) 34