PSLE
Three men, Kit, Sam and Don had the same number of notes. Sam and Kit each had of mix of $100-notes and $10-notes. Sam had 5 $10-notes while Kit had 12 $10-notes. Don had only $100-notes.

1. Of the three men, who had the least money? 
2. What was the difference in the total value of Sam and Kit's notes? 
3. Kit used all his $100-notes to buy a gift. Don then had $1780 more than Kit. How many $100-notes did Don have?

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

Kit had more $10-notes than Sam while Don had only the $100-notes.  

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

(b)
Difference in the number of notes of different values
= 12 - 5
= 7

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

Difference in the total value of Sam's and Kit's notes
= 7 x 90
= $630

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

Total value that Don had
= 1780 + 120
= $1900

Number of $100-notes that Don had
= 1900 ÷ 100
= 19

Answer(s): (a) Kit; (b) $630; (c) 19