Answer:
tickets were sold to student and
tickets were sold to adults
Explanation:
Let the number of tickets purchased by students be "X" and the number of tickets purchased by adults be "Y"
Given
Total number of tickets sold 
Total amount collected by selling
tickets
dollar
Cost of one ticket of student
dollar
Cost of one ticket of adult
9 dollar
Two equation are as follows
------Eq (1)
-------- Eq (2)
Multiplying eq (1) by 9 and subtracting from equation 2 we get

Substituting the value of X in equation 1 we get

Therefore,
tickets were sold to student and
tickets were sold to adults
Answer:
c. a decrease in the wage rate of accountants
Explanation:
As a result of the revision that makes personal tax returns much easier to complete, people would no longer need the services of accountants to calculate their tax returns. As a result, the demand for accountants would fall, all other things remaining equal.
The fall in demand would lead to a fall in wage rate of accountants
Please check the attached image for a graph explaining this concept
Answer:
The correct answer is: price elastic; increase.
Explanation:
The price elasticity of demand for apples is 1.2.
This implies that the demand relatively prices elastic.
Elastic demand means that a proportionate change in the price of apples will cause more than proportionate change in the quantity demanded.
A decrease in the price of apples will cause its quantity demanded to increase by more than proportionate. This will cause total revenue to increase.
It would have to be 20000