PSLE
Three boys, Eli, Ben and Rio had the same number of notes. Eli and Ben each had of mix of $20-notes and $5-notes. Eli had 8 $5-notes while Ben had 20 $5-notes. Rio had only $20-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Eli and Ben's notes? 
3. Ben used all his $20-notes to buy a gift. He then had $480 less than Rio. How many $20-notes did Rio have?

(a)
The three boys had the same number of notes.
$5-notes have a lower denomination than $20-notes.

Since Rio had only $20-notes, he had the most money.

(b)
Difference in the number of notes of different values
= 20 - 8
= 12

Difference in the value of $20-notes and $5-notes
= 20 - 5
= $15

Difference in the total value of Eli's and Ben's notes
= 12 x 15
= $180

(c)
Value of $5-notes that Ben had left
= 20 x 5
= $100

Total value that Rio had
= 480 + 100
= $580

Number of $20-notes that Rio had
= 580 ÷ 20
= 29

Answer(s): (a) Rio; (b) $180; (c) 29