PSLE
Three men, Zac, Don and Ray had the same number of notes. Don and Zac each had of mix of $100-notes and $20-notes. Don had 16 $20-notes while Zac had 23 $20-notes. Ray 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 Zac's notes? 
3. Zac used all his $100-notes to buy a present. Ray then had $2540 more than Zac. How many $100-notes did Ray have?

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

Zac had more $20-notes than Don while Ray had only the $100-notes.  

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

(b)
Difference in the number of notes of different values
= 23 - 16
= 7

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

Difference in the total value of Don's and Zac's notes
= 7 x 80
= $560

(c)
Value of $20-notes that Zac had left
= 23 x 20
= $460

Total value that Ray had
= 2540 + 460
= $3000

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

Answer(s): (a) Zac; (b) $560; (c) 30