The number of 20-cent coins in a box is as many as the number of $1-dollar coins. The total value of the coins is $39.60.
- Find the total number of coins in the box.
- Find the total value of 20-cent coins in the box.
|
20-cent |
$1-dollar |
Total |
Number |
1 u |
1 u |
2 u |
Value |
0.20 |
1 |
|
Total value |
0.2 u |
1 u |
1.2 u |
(a)
Total value of 20-cent and $1 coins
= 0.20 x 1 u + 1 x 1 u
= 0.2 u + 1 u
= 1.2 u
1.2 u = 39.60
1 u = 39.60 ÷ 1.2 = 33
Total number of coins
= 2 u
= 2 x 33
= 66
(b)
Total value of 20-cent coins
= 33 x 0.20
= $6.60
Answer(s): (a) 66; (b) $6.60