Adam has $600 in $1-notes and $20-notes.
There are 5 times as many $1-notes as $20-notes.
- How many notes are there?
- How much is the value of all the $20-notes?
|
$1 |
$20 |
Total |
Number of notes |
5 u |
1 u |
6 u |
Value of notes |
5 x 1 = 5 u |
1 x 20 = 20 u |
25 u |
(a)
Let the number of $20 notes be 1 u.
Number of $20 notes = 1 u
Number of $1 notes = 5 x 1 u = 5 u
Value of $1 notes = 5 u x 1 = 5 u
Value of $20 notes = 1 u x 20 = 20 u
Total value of notes = 20 u + 5 u = 25 u
25 u = 600
1 u = 600 ÷ 25 = 24
Total number of notes
= 5 u + 1 u
= 6 u
= 6 x 24
= 144
(b)
Value of all the $20-notes
= 20 u
= 20 x 24
= $480
Answer(s): (a) 144; (b) $480