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Which choice is equal to √4?

5
3
1
2

Which choice is equal to 12÷4?

5
3
1
2

What is the result of 4−2?

5
3
1
2
I have 30 Cows in my farm because of the harsh winter 10 of them died later in Spring every Cow gave birth to the 2 Child. How many Cows do I have now?