Answer:
The estimated area is 
Step-by-step explanation:
we know that
To estimate the area that Ivan will paint , calculate the area of one wall and then multiply by 3
step 1
Convert the dimensions to an improper fractions


step 2
Find the area of one wall

step 3
Multiply the area of one wall by 3

step 4
Convert to mixed number

Each kid ticket will cost 12.25 dollars because 18.50 times 12 equals 222 dollars. You subtract 222 from 344.50 to get the total amount for 10 kids which is 122.50 dollars. 122.50 divides by 10 is 12.50.
252 is the answer because you can square of every small box to each parts area then add it up
Please find attached photograph for your answer