PSLE
Three boys, Ben, Rey and Don had the same number of notes. Ben and Rey each had of mix of $10-notes and $2-notes. Ben had 2 $2-notes while Rey had 17 $2-notes. Don had only $10-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Ben and Rey's notes? 
3. Rey used all his $10-notes to buy a souvenir. He then had $266 less than Don. How many $10-notes did Don have?

(a)
The three boys had the same number of notes.
$2-notes have a lower denomination than $10-notes.

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

(b)
Difference in the number of notes of different values
= 17 - 2
= 15

Difference in the value of $10-notes and $2-notes
= 10 - 2
= $8

Difference in the total value of Ben's and Rey's notes
= 15 x 8
= $120

(c)
Value of $2-notes that Rey had left
= 17 x 2
= $34

Total value that Don had
= 266 + 34
= $300

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

Answer(s): (a) Don; (b) $120; (c) 30