PSLE
Three boys, Asa, Dan and Nat had the same number of notes. Asa and Dan each had of mix of $10-notes and $5-notes. Asa had 13 $5-notes while Dan had 18 $5-notes. Nat had only $10-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 $10-notes to buy a souvenir. He then had $150 less than Nat. How many $10-notes did Nat have?

(a)
The three boys had the same number of notes.
$5-notes have a lower denomination than $10-notes.

Since Nat had only $10-notes, he had the most money.

(b)
Difference in the number of notes of different values
= 18 - 13
= 5

Difference in the value of $10-notes and $5-notes
= 10 - 5
= $5

Difference in the total value of Asa's and Dan's notes
= 5 x 5
= $25

(c)
Value of $5-notes that Dan had left
= 18 x 5
= $90

Total value that Nat had
= 150 + 90
= $240

Number of $10-notes that Nat had
= 240 ÷ 10
= 24

Answer(s): (a) Nat; (b) $25; (c) 24