Ineed with this problem! quickly !

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Ihonestly have no clue if it's each or none.