Answer:
34
Step-by-step explanation:
Castle is 10 years old.
You divide: 22/12= 10
π
There are 77 more third graders than second graders.
415-338=x
x=77
change,c = 20 - p
so in Excel for example
put 20 in column a
put 11.59, 17.50 etc in column b
in column c put the equation '=20 - b1'
