Adam has some $10-notes and some $20-notes that add up to $390.
There are 3 less $20-notes than $10-notes.
- What is the value of the extra 3 $10-notes?
- What is the value of one $10-note and one $20-note?
- How many $20 notes are there?
- How many $10 notes are there?
(a)
Value of the extra 3 $10 notes
= 3 x 10
= $30
(b)
Value of one $10-note and one $20-note
= 10 + 20
= $30
(c)
Number of $20 notes
= (390 - 30) ÷ 30
= 360 ÷ 30
= 12
(d)
Number of $10 notes
= 12 + 3
= 15
Answer(s): (a) $30; (b) $30; (c) 12; (d) 15