There are a total of 270 pieces of 5-cent coins, 20-cent coins and 50-cent coins in Luke's glass jar.
29 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 Luke's glass jar?
(a)
Number of 5-cent coins
=
29 x 270
= 60
Number of 20-cent coins and 50-cent coins
= 270 - 60
= 210
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 = 210
1 u = 210 ÷ 6 = 35
Number of 50-cent coins
= 5 u
= 5 x 35
= 175
(b)
100¢ = $1
Total value of the 50-cent coins in Luke's glass jar
= 175 x 50
= 8750¢
= $87.50
Answer(s): (a) 175; (b) $87.50