...when 24 more pennies are placed into the jar, the probablity of pulling out a penny becomes 1/2. How many pennies, nickels and dimes were in the jar to begin with?
2007-03-08 10:36:13 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
so originally, the probability of pulling a penny is 1/3, and when you add 24 pennies, the probability is 1/2.
originally there were 24 pennies, 24 nickels, and 24 dimes. when you add 24 pennies, it becomes 48 pennies/96 coins or 1/2.
2007-03-08 10:41:59 · answer #1 · answered by David 3 · 0⤊ 0⤋
x = original amount of pennies, nickels, dimes
x + 24 = 1/2 * (3x + 24)
2x + 48 = 3x + 24
24 = x
24 pennies, 24 nickels, 24 dimes
Check: add 24 pennies = 48 pennies
Total then: 48 + 24 + 24 = 96 coins
48 is 1/2 of 96.
2007-03-08 10:45:21 · answer #2 · answered by ecolink 7 · 0⤊ 0⤋
24 pennies, 24 dimes, and 24 nickels
2007-03-08 10:42:58 · answer #3 · answered by bruinfan 7 · 0⤊ 0⤋
24 pennies, 24 nickels, 24 dimes.........................
2007-03-08 10:46:27 · answer #4 · answered by Anonymous · 0⤊ 0⤋