There are a total of 330 pieces of 5-cent coins, 20-cent coins and 50-cent coins in Eric's glass jar.
45 of these coins are 5-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 5-cent coins
=
45 x 330
= 264
Number of 20-cent coins and 50-cent coins
= 330 - 264
= 66
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 = 66
1 u = 66 ÷ 6 = 11
Number of 50-cent coins
= 5 u
= 5 x 11
= 55
(b)
100¢ = $1
Total value of the 50-cent coins in Eric's glass jar
= 55 x 50
= 2750¢
= $27.50
Answer(s): (a) 55; (b) $27.50