There are a total of 180 pieces of 5-cent coins, 10-cent coins and 50-cent coins in Vincent's tin can.
45 of these coins are 5-cent coins. The number of 50-cent coins is thrice the number of 10-cent coins.
- How many 50-cent coins are there?
- What is the total value of the 50-cent coins in Vincent's tin can?
(a)
Number of 5-cent coins
=
45 x 180
= 144
Number of 10-cent coins and 50-cent coins
= 180 - 144
= 36
Number of 10-cent coins = 1 u
Number of 50-cent coins = 3 u
Number of 10-cent coins
= 1 u + 3 u
= 4 u
4 u = 36
1 u = 36 ÷ 4 = 9
Number of 50-cent coins
= 3 u
= 3 x 9
= 27
(b)
100¢ = $1
Total value of the 50-cent coins in Vincent's tin can
= 27 x 50
= 1350¢
= $13.50
Answer(s): (a) 27; (b) $13.50