PSLE
Three boys, Ari, Max and Joe had the same number of notes. Ari and Max each had of mix of $10-notes and $5-notes. Ari had 4 $5-notes while Max had 11 $5-notes. Joe had only $10-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Ari and Max's notes? 
3. Max used all his $10-notes to buy a gift. He then had $215 less than Joe. How many $10-notes did Joe have?

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

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

(b)
Difference in the number of notes of different values
= 11 - 4
= 7

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

Difference in the total value of Ari's and Max's notes
= 7 x 5
= $35

(c)
Value of $5-notes that Max had left
= 11 x 5
= $55

Total value that Joe had
= 215 + 55
= $270

Number of $10-notes that Joe had
= 270 ÷ 10
= 27

Answer(s): (a) Joe; (b) $35; (c) 27