PSLE
Three men, Gus, Kai and Lon had the same number of notes. Kai and Gus each had of mix of $50-notes and $10-notes. Kai had 3 $10-notes while Gus had 21 $10-notes. Lon had only $50-notes.

1. Of the three men, who had the least money? 
2. What was the difference in the total value of Kai and Gus's notes? 
3. Gus used all his $50-notes to buy a gift. Lon then had $1140 more than Gus. How many $50-notes did Lon have?

(a)
The three men had the same number of notes.
$10-notes have a lower denomination than $50-notes.

Gus had more $10-notes than Kai while Lon had only the $50-notes.  

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

(b)
Difference in the number of notes of different values
= 21 - 3
= 18

Difference in the value of $50-note and $10-note
= 50 - 10
= $40

Difference in the total value of Kai's and Gus's notes
= 18 x 40
= $720

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

Total value that Lon had
= 1140 + 210
= $1350

Number of $50-notes that Lon had
= 1350 ÷ 50
= 27

Answer(s): (a) Gus; (b) $720; (c) 27