PSLE
Three boys, Asa, Dan and Jon had the same number of notes. Asa and Dan each had of mix of $20-notes and $10-notes. Asa had 12 $10-notes while Dan had 17 $10-notes. Jon had only $20-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Asa and Dan's notes? 
3. Dan used all his $20-notes to buy a present. He then had $350 less than Jon. How many $20-notes did Jon have?

(a)
The three boys had the same number of notes.
$10-notes have a lower denomination than $20-notes.

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

(b)
Difference in the number of notes of different values
= 17 - 12
= 5

Difference in the value of $20-notes and $10-notes
= 20 - 10
= $10

Difference in the total value of Asa's and Dan's notes
= 5 x 10
= $50

(c)
Value of $10-notes that Dan had left
= 17 x 10
= $170

Total value that Jon had
= 350 + 170
= $520

Number of $20-notes that Jon had
= 520 ÷ 20
= 26

Answer(s): (a) Jon; (b) $50; (c) 26