numeriq ability

1)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)

2)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)

3)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.
(Ans is 150,000)