PSLE
Three boys, Kai, Lee and Ray had the same number of notes. Kai and Lee each had of mix of $20-notes and $5-notes. Kai had 5 $5-notes while Lee had 11 $5-notes. Ray had only $20-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Kai and Lee's notes? 
3. Lee used all his $20-notes to buy a souvenir. He then had $545 less than Ray. How many $20-notes did Ray have?

(a)
The three boys had the same number of notes.
$5-notes have a lower denomination than $20-notes.

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

(b)
Difference in the number of notes of different values
= 11 - 5
= 6

Difference in the value of $20-notes and $5-notes
= 20 - 5
= $15

Difference in the total value of Kai's and Lee's notes
= 6 x 15
= $90

(c)
Value of $5-notes that Lee had left
= 11 x 5
= $55

Total value that Ray had
= 545 + 55
= $600

Number of $20-notes that Ray had
= 600 ÷ 20
= 30

Answer(s): (a) Ray; (b) $90; (c) 30