PSLE
Three boys, Tom, Nat and Don had the same number of notes. Tom and Nat each had of mix of $5-notes and $2-notes. Tom had 3 $2-notes while Nat had 15 $2-notes. Don had only $5-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Tom and Nat's notes? 
3. Nat used all his $5-notes to buy a souvenir. He then had $100 less than Don. How many $5-notes did Don have?

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

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

(b)
Difference in the number of notes of different values
= 15 - 3
= 12

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

Difference in the total value of Tom's and Nat's notes
= 12 x 3
= $36

(c)
Value of $2-notes that Nat had left
= 15 x 2
= $30

Total value that Don had
= 100 + 30
= $130

Number of $5-notes that Don had
= 130 ÷ 5
= 26

Answer(s): (a) Don; (b) $36; (c) 26