PSLE
Three men, Bo, Don and Ken had the same number of notes. Don and Bo each had of mix of $100-notes and $10-notes. Don had 3 $10-notes while Bo had 13 $10-notes. Ken had only $100-notes.

1. Of the three men, who had the least money? 
2. What was the difference in the total value of Don and Bo's notes? 
3. Bo used all his $100-notes to buy a souvenir. Ken then had $2270 more than Bo. How many $100-notes did Ken have?

(a)
The three men had the same number of notes.
$10-notes have a lower denomination than $100-notes.

Bo had more $10-notes than Don while Ken had only the $100-notes.  

Since Bo had the most number of $10-notes, he had the least money.

(b)
Difference in the number of notes of different values
= 13 - 3
= 10

Difference in the value of $100-note and $10-note
= 100 - 10
= $90

Difference in the total value of Don's and Bo's notes
= 10 x 90
= $900

(c)
Value of $10-notes that Bo had left
= 13 x 10
= $130

Total value that Ken had
= 2270 + 130
= $2400

Number of $100-notes that Ken had
= 2400 ÷ 100
= 24

Answer(s): (a) Bo; (b) $900; (c) 24