how many of each kind of fish did Sophie purchase?

Question

Sophie bought a total of 27 guppies and angle fish. She bought twice as many guppies as many guppies as angle fish

Answer 1

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.

 

 

 

Answer 2

Hi again Travina;

x=angle fish

2x=guppies

27=x+2x

27=3x

Let's divide both sides by 3...

27/3=(3x)/3

9=x

9 angle fish

2(9)=18 guppies