Adam has $900 in $5-notes and $10-notes.
There are 2 times as many $5-notes as $10-notes.
- How many notes are there?
- How much is the value of all the $10-notes?
| |
$5 |
$10 |
Total |
| Number of notes |
2 u |
1 u |
3 u |
| Value of notes |
2 x 5 =
10 u |
1 x 10 =
10 u |
20 u |
(a)
Let the number of $10 notes be 1 u.
Number of $10 notes = 1 u
Number of $5 notes = 2 x 1 u = 2 u
Value of $5 notes = 2 u x 5 = 10 u
Value of $10 notes = 1 u x 10 = 10 u
Total value of notes = 10 u + 10 u = 20 u
20 u = 900
1 u = 900 ÷ 20 = 45
Total number of notes
= 2 u + 1 u
= 3 u
= 3 x 45
= 135
(b)
Value of all the $10-notes
= 10 u
= 10 x 45
= $450
Answer(s): (a) 135; (b) $450
