PSLE
Three men, Jed, Ben and Don had the same number of notes. Ben and Jed each had of mix of $100-notes and $10-notes. Ben had 15 $10-notes while Jed had 21 $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 Ben and Jed's notes? 
3. Jed used all his $100-notes to buy a gift. Don then had $2690 more than Jed. 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.

Jed had more $10-notes than Ben while Don had only the $100-notes.  

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

(b)
Difference in the number of notes of different values
= 21 - 15
= 6

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

Difference in the total value of Ben's and Jed's notes
= 6 x 90
= $540

(c)
Value of $10-notes that Jed had left
= 21 x 10
= $210

Total value that Don had
= 2690 + 210
= $2900

Number of $100-notes that Don had
= 2900 ÷ 100
= 29

Answer(s): (a) Jed; (b) $540; (c) 29