PSLE
Three men, Nat, Don and Ike had the same number of notes. Don and Nat each had of mix of $50-notes and $20-notes. Don had 2 $20-notes while Nat had 19 $20-notes. Ike had only $50-notes.

1. Of the three men, who had the least money? 
2. What was the difference in the total value of Don and Nat's notes? 
3. Nat used all his $50-notes to buy a present. Ike then had $1020 more than Nat. How many $50-notes did Ike have?

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

Nat had more $20-notes than Don while Ike had only the $50-notes.  

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

(b)
Difference in the number of notes of different values
= 19 - 2
= 17

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

Difference in the total value of Don's and Nat's notes
= 17 x 30
= $510

(c)
Value of $20-notes that Nat had left
= 19 x 20
= $380

Total value that Ike had
= 1020 + 380
= $1400

Number of $50-notes that Ike had
= 1400 ÷ 50
= 28

Answer(s): (a) Nat; (b) $510; (c) 28