The number of 5-cent coins in a box is as many as the number of $1-dollar coins. The total value of the coins is $37.80.
- Find the total number of coins in the box.
- Find the total value of 5-cent coins in the box.
|
5-cent |
$1-dollar |
Total |
Number |
1 u |
1 u |
2 u |
Value |
0.05 |
1 |
|
Total value |
0.05 u |
1 u |
1.05 u |
(a)
Total value of 5-cent and $1 coins
= 0.05 x 1 u + 1 x 1 u
= 0.05 u + 1 u
= 1.05 u
1.05 u = 37.80
1 u = 37.80 ÷ 1.05 = 36
Total number of coins
= 2 u
= 2 x 36
= 72
(b)
Total value of 5-cent coins
= 36 x 0.05
= $1.80
Answer(s): (a) 72; (b) $1.80