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October 25, 2014

October 25, 2014

Posted by **Rayyan** on Saturday, December 15, 2012 at 4:59pm.

- Algebra -
**Asi**, Saturday, December 15, 2012 at 6:13pmIt's a system of equations problem. Just represent the values with different expressions as they relate.

givens:

28 animals total

number of piranhas = 1 more than turtles

number of piranhas = 2 less than number of beta fish

let x = number of piranhas

piranhas = x

turtles = x - 1 (there's one less turtle)

number of beta fish = x + 2 (there are two more beta fish than piranhas)

now you can put all the expressions together and equate it to the total number of creatures in the tank.

x + x - 1 + x + 2 = 28

simplifies to 3x + 1 = 28

now solve for x

3x + 1 = 28

-1 -1

3x = 27

/3 /3

x = 9

now plug this value in the expression you used to represent the beta fish --

(x + 2)

x = 9 so 9 + 2 = 11

there are 11 beta fish in the aquarium

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