There are a total of 210 pieces of 10-cent coins, 20-cent coins and 50-cent coins in Eric's glass jar.
27 of these coins are 10-cent coins. The number of 50-cent coins is five times the number of 20-cent coins.
- How many 50-cent coins are there?
- What is the total value of the 50-cent coins in Eric's glass jar?
(a)
Number of 10-cent coins
=
27 x 210
= 60
Number of 20-cent coins and 50-cent coins
= 210 - 60
= 150
Number of 20-cent coins = 1 u
Number of 50-cent coins = 5 u
Number of 20-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 Eric's glass jar
= 125 x 50
= 6250¢
= $62.50
Answer(s): (a) 125; (b) $62.50