There are a total of 240 pieces of 5-cent coins, 10-cent coins and 50-cent coins in Elijah's coin box.
38 of these coins are 5-cent coins. The number of 50-cent coins is five times the number of 10-cent coins.
- How many 50-cent coins are there?
- What is the total value of the 50-cent coins in Elijah's coin box?
(a)
Number of 5-cent coins
=
38 x 240
= 90
Number of 10-cent coins and 50-cent coins
= 240 - 90
= 150
Number of 10-cent coins = 1 u
Number of 50-cent coins = 5 u
Number of 10-cent coins
= 1 u + 5 u
= 6 u
6 u = 150
1 u = 150 ÷ 6 = 25
Number of 50-cent coins
= 5 u
= 5 x 25
= 125
(b)
100¢ = $1
Total value of the 50-cent coins in Elijah's coin box
= 125 x 50
= 6250¢
= $62.50
Answer(s): (a) 125; (b) $62.50