Adam has $300 in $1-notes and $10-notes.
There are 5 times as many $1-notes as $10-notes.
- How many notes are there?
- How much is the value of all the $10-notes?
|
$1 |
$10 |
Total |
Number of notes |
5 u |
1 u |
6 u |
Value of notes |
5 x 1 = 5 u |
1 x 10 = 10 u |
15 u |
(a)
Let the number of $10 notes be 1 u.
Number of $10 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 $10 notes = 1 u x 10 = 10 u
Total value of notes = 10 u + 5 u = 15 u
15 u = 300
1 u = 300 ÷ 15 = 20
Total number of notes
= 5 u + 1 u
= 6 u
= 6 x 20
= 120
(b)
Value of all the $10-notes
= 10 u
= 10 x 20
= $200
Answer(s): (a) 120; (b) $200