PSLE
Three boys, Ace, Jon and Gus had the same number of notes. Ace and Jon each had of mix of $10-notes and $5-notes. Ace had 7 $5-notes while Jon had 17 $5-notes. Gus had only $10-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Ace and Jon's notes? 
3. Jon used all his $10-notes to buy a souvenir. He then had $215 less than Gus. How many $10-notes did Gus have?

(a)
The three boys had the same number of notes.
$5-notes have a lower denomination than $10-notes.

Since Gus had only $10-notes, he had the most money.

(b)
Difference in the number of notes of different values
= 17 - 7
= 10

Difference in the value of $10-notes and $5-notes
= 10 - 5
= $5

Difference in the total value of Ace's and Jon's notes
= 10 x 5
= $50

(c)
Value of $5-notes that Jon had left
= 17 x 5
= $85

Total value that Gus had
= 215 + 85
= $300

Number of $10-notes that Gus had
= 300 ÷ 10
= 30

Answer(s): (a) Gus; (b) $50; (c) 30