Adam has $800 in $5-notes and $20-notes.
There are 4 times as many $5-notes as $20-notes.
- How many notes are there?
- How much is the value of all the $20-notes?
| |
$5 |
$20 |
Total |
| Number of notes |
4 u |
1 u |
5 u |
| Value of notes |
4 x 5 =
20 u |
1 x 20 =
20 u |
40 u |
(a)
Let the number of $20 notes be 1 u.
Number of $20 notes = 1 u
Number of $5 notes = 4 x 1 u = 4 u
Value of $5 notes = 4 u x 5 = 20 u
Value of $20 notes = 1 u x 20 = 20 u
Total value of notes = 20 u + 20 u = 40 u
40 u = 800
1 u = 800 ÷ 40 = 20
Total number of notes
= 4 u + 1 u
= 5 u
= 5 x 20
= 100
(b)
Value of all the $20-notes
= 20 u
= 20 x 20
= $400
Answer(s): (a) 100; (b) $400
