There are a total of 360 pieces of 5-cent coins, 20-cent coins and 50-cent coins in Gabriel's piggy bank.
310 of these coins are 5-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 Gabriel's piggy bank?
(a)
Number of 5-cent coins
=
310 x 360
= 108
Number of 20-cent coins and 50-cent coins
= 360 - 108
= 252
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 = 252
1 u = 252 ÷ 4 = 63
Number of 50-cent coins
= 3 u
= 3 x 63
= 189
(b)
100¢ = $1
Total value of the 50-cent coins in Gabriel's piggy bank
= 189 x 50
= 9450¢
= $94.50
Answer(s): (a) 189; (b) $94.50