Adam has $800 in $5-notes and $10-notes.
There are 3 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 |
3 u |
1 u |
4 u |
Value of notes |
3 x 5 = 15 u |
1 x 10 = 10 u |
25 u |
(a)
Let the number of $10 notes be 1 u.
Number of $10 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 $10 notes = 1 u x 10 = 10 u
Total value of notes = 10 u + 15 u = 25 u
25 u = 800
1 u = 800 ÷ 25 = 32
Total number of notes
= 3 u + 1 u
= 4 u
= 4 x 32
= 128
(b)
Value of all the $10-notes
= 10 u
= 10 x 32
= $320
Answer(s): (a) 128; (b) $320