Giraffe 2

The lifespan of a guinea pig is 6 years less than that of a giraffe. The lifespan of a tiger is 4 times that of the guinea pig. If the total lifespan of the animals is 30 years, calculate the longevity for the giraffe.

Correct result:

g =  10

Solution:

p=g-6
t=4p
t+p+g=30

p=g-6
t=4•p
t+p+g=30

g-p = 6
4p-t = 0
g+p+t = 30

g = 10
p = 4
t = 16

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