PSLE
Three boys, Kit, Rey and Sam had the same number of notes. Kit and Rey each had of mix of $20-notes and $10-notes. Kit had 6 $10-notes while Rey had 12 $10-notes. Sam had only $20-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Kit and Rey's notes? 
3. Rey used all his $20-notes to buy a souvenir. He then had $420 less than Sam. How many $20-notes did Sam have?

(a)
The three boys had the same number of notes.
$10-notes have a lower denomination than $20-notes.

Since Sam had only $20-notes, he had the most money.

(b)
Difference in the number of notes of different values
= 12 - 6
= 6

Difference in the value of $20-notes and $10-notes
= 20 - 10
= $10

Difference in the total value of Kit's and Rey's notes
= 6 x 10
= $60

(c)
Value of $10-notes that Rey had left
= 12 x 10
= $120

Total value that Sam had
= 420 + 120
= $540

Number of $20-notes that Sam had
= 540 ÷ 20
= 27

Answer(s): (a) Sam; (b) $60; (c) 27