PSLE
Three men, Lon, Don and Ned had the same number of notes. Don and Lon each had of mix of $100-notes and $50-notes. Don had 3 $50-notes while Lon had 19 $50-notes. Ned had only $100-notes.

1. Of the three men, who had the least money? 
2. What was the difference in the total value of Don and Lon's notes? 
3. Lon used all his $100-notes to buy a present. Ned then had $1550 more than Lon. How many $100-notes did Ned have?

(a)
The three men had the same number of notes.
$50-notes have a lower denomination than $100-notes.

Lon had more $50-notes than Don while Ned had only the $100-notes.  

Since Lon had the most number of $50-notes, he had the least money.

(b)
Difference in the number of notes of different values
= 19 - 3
= 16

Difference in the value of $100-note and $50-note
= 100 - 50
= $50

Difference in the total value of Don's and Lon's notes
= 16 x 50
= $800

(c)
Value of $50-notes that Lon had left
= 19 x 50
= $950

Total value that Ned had
= 1550 + 950
= $2500

Number of $100-notes that Ned had
= 2500 ÷ 100
= 25

Answer(s): (a) Lon; (b) $800; (c) 25