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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1053
GPA: 3.39
A piggy-bank contains a certain number of coins, of which 53
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17 Mar 2020, 00:42
17 Mar 2020, 00:42
Expert Reply
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Question Stats:
99% (01:09) correct
0% (00:00) wrong based on 14 sessions
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A piggy-bank contains a certain number of coins, of which 53 are dimes and 19 are nickels. The remainder of the coins in the bank are quarters. If the probability of selecting a quarter from this bank is 1/4, how many quarters does the bank contain?
(A) 30
(B) 27
(C) 24
(D) 21
(E) 16
(A) 30
(B) 27
(C) 24
(D) 21
(E) 16
Re: A piggy-bank contains a certain number of coins, of which 53
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Updated on: 25 Apr 2020, 10:31
Updated on: 25 Apr 2020, 10:31
2
A piggy-bank contains a certain number of coins, of which 53 are dimes and 19 are nickels. The remainder of the coins in the bank are quarters. If the probability of selecting a quarter from this bank is 1/4, how many quarters does the bank contain?
Total Coins= A
#Dimes=53
#Nickles=19
Total Quarters=(Total Coins-#Dimes-#Nickles)
P(Quarters)= P(Success/Total Outcomes)= (Total Quarters/ Total coins)=1/4
P=(Total Quarters/Total Coins)= (A-53-19)/A = 1/4
4(A-72)=A
4A-228=A
3A=228
A=96-->
Total Quarters=(Total Coins-#Dimes-#Nickles)
Quartes = 96-53-19
Quartes =24
Option C
Total Coins= A
#Dimes=53
#Nickles=19
Total Quarters=(Total Coins-#Dimes-#Nickles)
P(Quarters)= P(Success/Total Outcomes)= (Total Quarters/ Total coins)=1/4
P=(Total Quarters/Total Coins)= (A-53-19)/A = 1/4
4(A-72)=A
4A-228=A
3A=228
A=96-->
Total Quarters=(Total Coins-#Dimes-#Nickles)
Quartes = 96-53-19
Quartes =24
Option C
Originally posted by JzContecha on 25 Apr 2020, 10:21.
Last edited by JzContecha on 25 Apr 2020, 10:31, edited 9 times in total.
Last edited by JzContecha on 25 Apr 2020, 10:31, edited 9 times in total.
Re: A piggy-bank contains a certain number of coins, of which 53
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25 Apr 2020, 10:26
25 Apr 2020, 10:26
Expert Reply
Please Sir
Thank you for the good explanation but do not use the color yellow to highlight your contents.
It turns not clear when you read the post
Regards
Thank you for the good explanation but do not use the color yellow to highlight your contents.
It turns not clear when you read the post
Regards
