Quantitative Aptitude - Arithmetic Ability Questions

A boat moves down stream at the rate of 8km/hr. and upstream at 4Km/hr. The speed of the boat in still waters is:

For an article the profit is 190% of the cost price. If the cost price increase by 10% but the selling price remains same, then profit is what percentage of selling price (approximately)?

Akash starts a business with Rs 85000 and Payal joins him with Rs 102000. If the profit at the end of a year is divided in the ratio 1 : 1, then after how many months did Payal join Akash?

A can paint a house in 55 days and B can do it in 66 days. Along with C, they did the job in 12 days only. Then, C alone can do the job in how many days?

According to the will the wealth of Rs 21,25,000 was to be divided between the son and the daughter in the ratio 7/6 : 5/3. How much did the son get (in Rs)?

cot2A + cos2A is equal to

A and B together do a job in 6.75 days and A could do the job in 9 days if he worked alone. How many days would B take to do the job if he worked alone?

The maximum value of 5+20x-4x2, when X is real number