He has 4*3=<<4*3=12>>12 pregnant fish

They give birth to 12*20=<<12*20=240>>240 fish

# Answer

240
Question:
Mark has 3 tanks for pregnant fish.  Each tank has 4 pregnant fish and each fish gives birth to 20 young.  How many young fish does he have at the end?
Answer:
Let's think step by step.

user
240
Mark has 3 tanks for pregnant fish.  Each tank has 4 pregnant fish and each fish gives birth to 20 young.  How many young fish does he have at the end?
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