All means are not equal so the question is based on some misunderstanding.
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Different fractions are equal to different values.
It means having the same value.
It depends on the problem really because y is a variable and not a constant. It can also mean years so it will equal the amount of years the problem asks.
Assuming that by "lake" you mean a lakh, the answer is 1 million = 10 lakhs.
I think you mean zero to negative infinity is {x: x< or equal to 0}