Ian, Zac and Nat had the same number of notes. Ian and Zac had a mix of $20-notes and $5-notes. Ian had 6 $20-notes while Zac had 16 $20-notes. Nat only had $20-notes.

1. Who had the least amount of money?
2. How much more did Zac have than Ian?
3. Zac used all his $5-notes to buy a wallet. He then had $460 less than Nat. How many $20-notes did Nat have?

(a)
The three boys had the same number of notes.
$20-notes have a higher denomination than $5-notes.

Since Ian had the least number of $20-notes, he had the least money.

(b)
Number of more $20-notes that Zac had than Ian
= 16 - 6
= 10

Difference in the value of $20-note and $5-note
= 20 - 5
= $15

Amount that Zac had more than Ian
= 10 x 15
= $150

(c)
Value of $20-notes that Zac had left
= 16 x 20
= $320

Total value that Nat had
= 320 + 460
= $780

Number of $20-notes that Nat had
= 780 ÷ 20
= 39

Answer(s): (a) Ian; (b) $150; (c) 39