Search
Ask a question
0

how many of each kind of fish did Sophie purchase?

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

2 Answers by Expert Tutors

Tutors, sign in to answer this question.
Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
1
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
Ralph L. | Algebra I, II, Visual Basic, Beginning C++ tutorAlgebra I, II, Visual Basic, Beginning C...
4.0 4.0 (1 lesson ratings) (1)
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.