While doing a science experiment in the physics lab, Donna took 5 measurements of the temperature and wrote the average of those as an answer. If the measurements of the temperature are 1, -4, -3, 2 and 0 then what is the final answer of her experiment?

The number of schools in Brisbane is 25 less than twice the number of schools in Canberra. If the number of schools in Canberra is a, how many schools are there in Brisbane?

An amount of $ 7350 is made up with the notes of denominations $ 100, 50, 20, and 10. The number of $10 notes are 5 times the number of $20 notes. The number of $20 notes are 2 times the number of $50 notes. The number of $50 notes are 5 times the number of $100 notes. How many total notes of denomination $20 are there?