The number of 50-cent coins in a box is as many as the number of $1-dollar coins. The total value of the coins is $22.50.
- Find the total number of coins in the box.
- Find the total value of 50-cent coins in the box.
|
50-cent |
$1-dollar |
Total |
Number |
1 u |
1 u |
2 u |
Value |
0.50 |
1 |
|
Total value |
0.5 u |
1 u |
1.5 u |
(a)
Total value of 50-cent and $1 coins
= 0.50 x 1 u + 1 x 1 u
= 0.5 u + 1 u
= 1.5 u
1.5 u = 22.50
1 u = 22.50 ÷ 1.5 = 15
Total number of coins
= 2 u
= 2 x 15
= 30
(b)
Total value of 50-cent coins
= 15 x 0.50
= $7.50
Answer(s): (a) 30; (b) $7.50