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November 14th, 2018, 07:25 PM  #1 
Member Joined: Sep 2018 From: Japan Posts: 35 Thanks: 2  Number of Clown and Angel Fish
A tank had 20 clownfish and angelfish. 4 clownfish were sold and some angelfish were added to the tank such that the number of angelfish increased by 50%. After that, there were 18 fish in the tank altogether. How many clownfish were there in the tank at first? My work: # of clownfish = C # of anglefish = A [1] A tank had 20 clownfish and angelfish => C + A = 20 [2] 4 clownfish were sold and some angelfish were added to the tank such that the number of angelfish increased by 50%. After that, there were 18 fish in the tank altogether. => C  4 + (A + .5A) = 18 My question is in [2]. I'm guessing A is the total of anglefish, but we have to add .5A more because of a 50% increase? I'm I correct for what I did in [2]? 
November 14th, 2018, 07:43 PM  #2 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,981 Thanks: 994 
Correct.


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angel, clown, fish, number 
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