9514 1404 393
Answer:
- r + t = 25
- 2r +4t = 92
- 4 T-Rex, 21 triceratops
Step-by-step explanation:
For this we have to assume that the T-Rex has only 2 legs. Let r represent the number of T-Rex, and t represent the number of triceratops. The problem statement tells of two relationships:
r + t = 25 . . . . . . total number of dinosaurs in the exhibit
2r +4t = 92 . . . . total number of legs in the exhibit
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Multiplying the second equation by 1/2 and subtracting the first, we find ...
(1/2)(2r +4t) -(r +t) = 1/2(92) -(25)
t = 21 . . . . . . simplify
r = 25 -21 = 4
There are 4 T-Rex, and 21 triceratops.
