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how many of each kind of fish did Sophie purchase?

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2 Answers

Let  G be the number of guppies bought
Let A be the number of angle fish
 
so,
 
G + A = 27         eq. 1
 
G = 2A               eq. 2
 
subsitute eq. 2 into eq. 1
 
2A + A = 27
 
3A = 27
 
divide both sides by 3:
 
A = 9
 
so she bought 9 angle fish.
 
since G = 2A, the number of guppies she bought is 2(9) or 18 
 
therefore she bought 18 guppies and 9 angle fish.
 
 
 

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