EASY and LOGICAL question

1)The average salary of three employee is 95Rs.per week.
If one employee earns 115 and other earns 65 rupees.
how much will third be earn?
(Ans is 105Rs)

2)A company instaled 36 punching machines at the begining of
the year.In the spring they instaled 9 additional m/c's
and then discontinued 18 in the fall.How many were still
installed at the end of the year?
(Ans is 9)check

3)During a given week a programmer spend 1/4 of his time
preparing charts,3/8 of his time for coding,rest of his time
for debugging the programs.If he had 48 hrs during the week
how many hours did he spend debugging the program.
(Ans is 18hrs)

4)A 16 story building has 12000ft on each floor. Company A
rents 7 floors and company B rents 4 floors. What is the
number of square feet of unrented floor space?
(Ans is 60000 sqft)

5)A man owns 2/3 of a computer service buroue business and
sells 3/4 of his share for $75000.What is the value of the
business.