Rio, Kai and Roy had the same number of notes. Rio and Kai had a mix of $100-notes and $50-notes. Kai had 14 $100-notes while Rio had 17 $100-notes. Roy only had $100-notes.

1. Who had the least amount of money?
2. How much less did Kai have than Rio?
3. Rio used all his $50-notes to buy a wallet. He then had $3100 less than Roy. How many $100-notes did Roy have?

(a)
The three boys had the same number of notes.
$100-notes have a higher denomination than $50-notes.

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

(b)
Number of less $100-notes that Kai had than Rio
= 17 - 14
= 3

Difference in the value of $100-note and $50-note
= 100 - 50
= $50

Amount that Kai had less than Rio
= 3 x 50
= $150

(c)
Value of $100-notes that Rio had left
= 17 x 100
= $1700

Total value that Roy had
= 1700 + 3100
= $4800

Number of $100-notes that Roy had
= 4800 ÷ 100
= 48

Answer(s): (a) Kai; (b) $150; (c) 48