PSLE
Three men, Tom, Ray and Ben had the same number of notes. Ray and Tom each had of mix of $100-notes and $50-notes. Ray had 7 $50-notes while Tom had 12 $50-notes. Ben had only $100-notes.

1. Of the three men, who had the least money? 
2. What was the difference in the total value of Ray and Tom's notes? 
3. Tom used all his $100-notes to buy a souvenir. Ben then had $1200 more than Tom. How many $100-notes did Ben have?

(a)
The three men had the same number of notes.
$50-notes have a lower denomination than $100-notes.

Tom had more $50-notes than Ray while Ben had only the $100-notes.  

Since Tom had the most number of $50-notes, he had the least money.

(b)
Difference in the number of notes of different values
= 12 - 7
= 5

Difference in the value of $100-note and $50-note
= 100 - 50
= $50

Difference in the total value of Ray's and Tom's notes
= 5 x 50
= $250

(c)
Value of $50-notes that Tom had left
= 12 x 50
= $600

Total value that Ben had
= 1200 + 600
= $1800

Number of $100-notes that Ben had
= 1800 ÷ 100
= 18

Answer(s): (a) Tom; (b) $250; (c) 18