If x + [1/(4x)] = 5/2, then what is the value of (64x6+ 1)/8x3?

If 3x + [1/(5x)] = 7, then what is the value of 5x/(15x2+ 15x + 1)?

If x3+ 2x2– 5x + k is divisible by x + 1, then what is the value of k?

A person lent Rs 10000 to B for 3 years and Rs 6000 to C for 4 years on simple interest at same rate of interest and received Rs 5400 in all from both of
them as interest. What is the rate of interest (in %)?

If I walk at 7/6 of my usual speed, then I reach my office 15 minutes early. What is the usual time taken (in minutes) by me to reach the office?

a% of b + b% of a = ______

70% of the cost price of a article is equal to the 40% of its selling price. What is the profit or loss percentage?

The average age of 24 students is 12 years. It was observed that while calculating the average age, the age of a student was taken as 14 years instead of 8 years. What will be the correct average age (in years)?