There are a total of 260 pieces of 10-cent coins, 20-cent coins and 50-cent coins in Joey's piggy bank. 2/5 of these coins are 10-cent coins. The number of 50-cent coins is thrice the number of 20-cent coins
(a) How many 50-cent coins are there?
(b) What is the total value of the 50-cent coins in Joey's piggy bank?
Let number of 10-cent coins = 2/5 * 260 = 104
Let number of 20-cent coins = x.
then —— 50-cent coins = 3x
So, x + 3x + 104 = 260
=> 4x = 156
=> x = 39
So a) Number of 50-cent coins = 39 * 3 = 117.
b) Total value of coins = 117 * 50 = 5850 cent = $58.5