book Maths Puzzle Numerical Ability

Why is 10 to the zero power 1.

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A movie theater charges $8.00 for adults, $4.50 for children, and $6.00 for senior citizens. On one day 405 tickets were sold for a total $2320.00. If there are twice as many children tickets as adult tickets, then how many of each group were sold? What is the equation of the perpendicular bisector of the line between the points (2,2) and (6,6).