PSLE
Three boys, Ari, Roy and Jon had the same number of notes. Ari and Roy each had of mix of $5-notes and $2-notes. Ari had 5 $2-notes while Roy had 16 $2-notes. Jon had only $5-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Ari and Roy's notes? 
3. Roy used all his $5-notes to buy a present. He then had $78 less than Jon. How many $5-notes did Jon have?

(a)
The three boys had the same number of notes.
$2-notes have a lower denomination than $5-notes.

Since Jon had only $5-notes, he had the most money.

(b)
Difference in the number of notes of different values
= 16 - 5
= 11

Difference in the value of $5-notes and $2-notes
= 5 - 2
= $3

Difference in the total value of Ari's and Roy's notes
= 11 x 3
= $33

(c)
Value of $2-notes that Roy had left
= 16 x 2
= $32

Total value that Jon had
= 78 + 32
= $110

Number of $5-notes that Jon had
= 110 ÷ 5
= 22

Answer(s): (a) Jon; (b) $33; (c) 22