Quantitative Aptitude - Arithmetic Ability Questions

If 5/2 - (6/5)(x - 15/2) = -x/5, then what is the value of x?

What is the simplified value of 18 - 12 ?

Iftan 450=cot∅, then the value of ∅, in radians is 

A, B and C can do a job working alone in 6, 9 and 18 days respectively. They all work together for 1 day, then A and B quit. How many days C working alone will take to complete the remainder of the job?

Dipali bought a set of cups for Rs. 375, but then had to sell it later to clear old stocks for Rs. 345. What is the percentage of loss that she incurred?

Raghavendra sells a machine for Rs 43 lakhs at a loss. Had he sold it for Rs 52 lakh, his gain would have been 5 times the former loss. Find the cost price of the machine.

5% more is gained by selling a watch for Rs. 350 than by selling it for Rs. 340. The cost price of the watch is

ABCD is a quadrilateral with AB = 9 cm, BC = 40 cm, CD = 28 cm, DA = 15 cm and angle ABC is a right –angel
What is the area of quadrilateral ABCD?