PSLE
Three boys, Ty, Don and Bo had the same number of notes. Ty and Don each had of mix of $20-notes and $5-notes. Ty had 11 $5-notes while Don had 23 $5-notes. Bo had only $20-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Ty and Don's notes? 
3. Don used all his $20-notes to buy a gift. He then had $465 less than Bo. How many $20-notes did Bo have?

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

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

(b)
Difference in the number of notes of different values
= 23 - 11
= 12

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

Difference in the total value of Ty's and Don's notes
= 12 x 15
= $180

(c)
Value of $5-notes that Don had left
= 23 x 5
= $115

Total value that Bo had
= 465 + 115
= $580

Number of $20-notes that Bo had
= 580 ÷ 20
= 29

Answer(s): (a) Bo; (b) $180; (c) 29