Quantitative Aptitude - Arithmetic Ability Questions

Square of (3x – 5xy) is

If a + b = 10 and ab = 21, then the value of (a - b)2 is

A, B and C invest to start a restaurant. The total investment was Rs 3 lakhs. B invested Rs 50,000 more than A and C invested Rs 25,000 less than B. If the profit at the end of the year was Rs 14,400 then what is C's share of the profit (in Rs)?

Some carpenters promised to do a job in 15 days but 3 of them were absent and remaining did the job in 20 days. What was the original number of carpenters?

Mukesh sells two shirts. The cost price of the first shirt is equal to the selling price of the second shirt. The first shirt is sold at a profit of 30% and the second shirt is sold at a loss of 30%. What is the ratio of the selling price of the first shirt to the cost price of the second shirt?

The value of  (0.3)2/100=?

If 3 tan θ = cot θ where 0 < θ < π/2, then what is the value of θ ?

If 5x + 6(3-2x) = 4, then what is the value of x?