Snakes and vultures are eating rats in a field. If wild dogs are let into the field, what will be the immediate result ?

Question: Snakes and vultures are eating rats in a field. If wild dogs are let into the field, what will be the immediate result ?
(1) Decrease in the number of snakes
(2) Decrease in the number of vultures
(3) Decrease in the number of rats
(4) Increase in the number of snakes.

Answer: (3) Decrease in the number of rats
There will be a decrease in the number of rats simply because rat is a prey to all the three of them and this leads to just a single conclusion that there is decrease in the number of rats. 

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