A group of friends wants to go to the amusement park. They have $183.25 to spend on parking and admission. Parking is $12.25, and tickets cost $28.50 per person, including tax. How many people can go to the amusement park?
A rectangular auditorium seats 2709 people. The number of seats in each row exceeds the number of rows by 20. Find the number of seats in each row.
Formula for focal length of a lens is 1/v + 1/u= 1/f
Find f, if u = 27cm , v= 30 cm