Adam has $700 in $5-notes and $20-notes.
There are 3 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 |
3 u |
1 u |
4 u |
Value of notes |
3 x 5 = 15 u |
1 x 20 = 20 u |
35 u |
(a)
Let the number of $20 notes be 1 u.
Number of $20 notes = 1 u
Number of $5 notes = 3 x 1 u = 3 u
Value of $5 notes = 3 u x 5 = 15 u
Value of $20 notes = 1 u x 20 = 20 u
Total value of notes = 20 u + 15 u = 35 u
35 u = 700
1 u = 700 ÷ 35 = 20
Total number of notes
= 3 u + 1 u
= 4 u
= 4 x 20
= 80
(b)
Value of all the $20-notes
= 20 u
= 20 x 20
= $400
Answer(s): (a) 80; (b) $400