Quantitative Aptitude - Arithmetic Ability Questions

Robin can do a work alone in 9 days. Amit can do the same work alone in 6 days. Both of them finish the work together and they get a total Rs 2500. What isthe share (in Rs) of Robin?

Rs. 750 invested for 3 months gave an interest of Rs. 18. What was the simple rate of interest per annum?

If x2+ x = 19, then what is the value of (x + 5)2+ [1/(x + 5)2]?

When a number is increased by 216, it becomes 140% of itself. What is the number?

6.651 -­ (148.6 ­- x ) -­ 57.22 = 6.098. Find x.

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)?

A vendor buys 6 bananas for Rs 25 and sells them at 3 for Rs 20. What is his profit percentage?

A and B can do a piece of work in 24 and 30 daysrespectively. Both started the work and worked for 6 days.Then B leaves the work and C joins and the remaining workis completed by A and C together in 11 days. Find the days in which C alone can do the work