PSLE
Three men, Rio, Ned and Jon had the same number of notes. Ned and Rio each had of mix of $100-notes and $20-notes. Ned had 2 $20-notes while Rio had 10 $20-notes. Jon had only $100-notes.

1. Of the three men, who had the least money? 
2. What was the difference in the total value of Ned and Rio's notes? 
3. Rio used all his $100-notes to buy a gift. Jon then had $2800 more than Rio. How many $100-notes did Jon have?

(a)
The three men had the same number of notes.
$20-notes have a lower denomination than $100-notes.

Rio had more $20-notes than Ned while Jon had only the $100-notes.  

Since Rio had the most number of $20-notes, he had the least money.

(b)
Difference in the number of notes of different values
= 10 - 2
= 8

Difference in the value of $100-note and $20-note
= 100 - 20
= $80

Difference in the total value of Ned's and Rio's notes
= 8 x 80
= $640

(c)
Value of $20-notes that Rio had left
= 10 x 20
= $200

Total value that Jon had
= 2800 + 200
= $3000

Number of $100-notes that Jon had
= 3000 ÷ 100
= 30

Answer(s): (a) Rio; (b) $640; (c) 30