PSLE
Three boys, Max, Eli and Lee had the same number of notes. Max and Eli each had of mix of $20-notes and $5-notes. Max had 4 $5-notes while Eli had 19 $5-notes. Lee had only $20-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Max and Eli's notes? 
3. Eli used all his $20-notes to buy a souvenir. He then had $405 less than Lee. How many $20-notes did Lee have?

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

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

(b)
Difference in the number of notes of different values
= 19 - 4
= 15

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

Difference in the total value of Max's and Eli's notes
= 15 x 15
= $225

(c)
Value of $5-notes that Eli had left
= 19 x 5
= $95

Total value that Lee had
= 405 + 95
= $500

Number of $20-notes that Lee had
= 500 ÷ 20
= 25

Answer(s): (a) Lee; (b) $225; (c) 25