Answer:
14
Step-by-step explanation:
Answer:
you got there answer correct
Step-by-step explanation:
the lines all follow the answer
Answer:20%
Step-by-step explanation:216-180=36. 36/180=.20
Answer:
11x-5
Step-by-step explanation:
Answer:
The sum of the age of pupils is 81
Step-by-step explanation:
Let sum of age of 18pupils = x
Average ages = 4.5
Average = total/no. of pupil
4.5 = x/18
x = 81