PSLE
Three boys, Roy, Eli and Ike had the same number of notes. Roy and Eli each had of mix of $20-notes and $5-notes. Roy had 18 $5-notes while Eli had 23 $5-notes. Ike had only $20-notes.

1. Of the three boys, who had the most money? 
2. What was the difference in the total value of Roy and Eli's notes? 
3. Eli used all his $20-notes to buy a souvenir. He then had $445 less than Ike. How many $20-notes did Ike have?

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

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

(b)
Difference in the number of notes of different values
= 23 - 18
= 5

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

Difference in the total value of Roy's and Eli's notes
= 5 x 15
= $75

(c)
Value of $5-notes that Eli had left
= 23 x 5
= $115

Total value that Ike had
= 445 + 115
= $560

Number of $20-notes that Ike had
= 560 ÷ 20
= 28

Answer(s): (a) Ike; (b) $75; (c) 28