There are a total of 160 pieces of 10-cent coins, 20-cent coins and 50-cent coins in Bryan's piggy bank.
38 of these coins are 10-cent coins. The number of 50-cent coins is thrice the number of 20-cent coins.
- How many 50-cent coins are there?
- What is the total value of the 50-cent coins in Bryan's piggy bank?
(a)
Number of 10-cent coins
=
38 x 160
= 60
Number of 20-cent coins and 50-cent coins
= 160 - 60
= 100
Number of 20-cent coins = 1 u
Number of 50-cent coins = 3 u
Number of 20-cent coins
= 1 u + 3 u
= 4 u
4 u = 100
1 u = 100 ÷ 4 = 25
Number of 50-cent coins
= 3 u
= 3 x 25
= 75
(b)
100¢ = $1
Total value of the 50-cent coins in Bryan's piggy bank
= 75 x 50
= 3750¢
= $37.50
Answer(s): (a) 75; (b) $37.50