Test your skills of deduction with the July 2023 edition of Riddle Me This: How many pets are enough?
How many pets does my friend Nick have? All of them are dogs except two. All of them are cats except two. All of them are parakeets except two. What kinds of animals and how many of each animal does he have?
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Too easy.
Two could also be an answer. He could have 0 dogs, 0 cats, and 0 parakeets….
1 cat, 1 dog, and 1 parakeet; 3 total pets
can be solved by inspection, but to express algebraically:
N = 3 of pets = c+d+p, where c = # of cats = N-2; d = # of dogs =- N-2; and p = # of parakeets =- N-2
N = N-2+N-2+N-2 = 3N-6
2N = 6
N = 3
c=d=p = 1