PSLE
Three men, Rio, Hal and Eli had the same number of notes. Hal and Rio each had of mix of $50-notes and $20-notes. Hal had 9 $20-notes while Rio had 21 $20-notes. Eli had only $50-notes.

1. Of the three men, who had the least money? 
2. What was the difference in the total value of Hal and Rio's notes? 
3. Rio used all his $50-notes to buy a present. Eli then had $1080 more than Rio. How many $50-notes did Eli have?

(a)
The three men had the same number of notes.
$20-notes have a lower denomination than $50-notes.

Rio had more $20-notes than Hal while Eli had only the $50-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
= 21 - 9
= 12

Difference in the value of $50-note and $20-note
= 50 - 20
= $30

Difference in the total value of Hal's and Rio's notes
= 12 x 30
= $360

(c)
Value of $20-notes that Rio had left
= 21 x 20
= $420

Total value that Eli had
= 1080 + 420
= $1500

Number of $50-notes that Eli had
= 1500 ÷ 50
= 30

Answer(s): (a) Rio; (b) $360; (c) 30