Ruby went to the fair with $45. She bought 20 tickets for rides for $.25 each three lemonades for $1.25 each two bags of popcorn for one $1.10 each three entrance tickets for the animal barn for $1.75 each two bottles of water for $.85 each and three hotdogs for $2.25 each

How much did she spend
Tickets(rides and entrance to animal barn)
Drink(lemonade, and water)
Food(popcorn, and hotdogs)
Amount of money left

Tickets:

20 rides x $0.25/ride = $5
3 animal barn entrance tickets x $1.75/ticket = $5.25

Drinks:
3 lemonades x $1.25/lemonade = $3.75
2 bottles of water x $0.85/bottle = $1.70

Food:
2 bags of popcorn x $1.10/bag = $2.20
3 hotdogs x $2.25/hotdog = $6.75

Total spent:
$5 (tickets) + $5.25 (tickets) + $3.75 (drinks) + $1.70 (drinks) + $2.20 (food) + $6.75 (food) = $24.65

Amount of money left:
$45 - $24.65 = $20.35

Ruby spent $24.65 at the fair and has $20.35 left.