book Maths Puzzle Numerical Ability

The Roman poet Virgil was born in 70 b.c. How old was he on his birthday in 42 b.c.?

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book Other Question

can you please answer and explain step by step to this problem

12-[20-2(6 to the second power, divided by 3x2 to the second power)]
Show that the statement is sometimes true. Then give a counterexample to show that the statement is not always true.
|x|=x

|-x|=x

|x+y|=|x|+|y|