The following numbers form a series. Find the odd one out.

7, 15, 31, 63, 87, 127

A and C together can complete a work in ‘x’ days while B alone can complete the same work in ‘x – 2’ days. If A, B, and C, while working together can complete the work in (60/11) days, then find the value of ‘x’.

A biker travels at a speed of 32 km/hr for 6 hours each day on all days except Sunday. If his journey starts on a Wednesday, on which day will he reach his destination 2500 km away?

Abhishek invested Rs. 18,000 in a scheme offering x% simple interest for ‘x’ years. Interest earned by him after ‘x’ years is Rs. 11520. Find the simple interest earned by him, if he invested Rs. 8,000 at same rate of interest for four years.

Arun invested a certain sum at a rate of 20%, compounded annually for 2 years and received an interest of Rs. 3520. Find the interest received if the same amount is invested at 15% simple interest for 3 years.

What will come in place of the question mark (?) in the following series?

400, 394, 378, 352, 316, ?

What will come in place of the question mark (?) in the following series?

18, 31, 42, 49, 54, ?

If the edge of the cube is increased by 20%, then find the percentage increase in the volume of the cube.

The ratio of the pocket money of two persons ‘A’ and ‘B’ is 5:3, respectively. ‘A’ spends 80% of his pocket money while ‘B’ spends 75% of his pocket money. If the savings of ‘A’ is Rs. 120 more than that of ‘B’, then find the total pocket money of ‘A’.

Pankaj marked an article Rs. 480 above its cost price and earned a profit Rs. 352 after selling it by giving a discount of 10%. Find cost price of the article.

Ratio of present ages of ‘X’ and ‘Y’ is 3:4, respectively. If the age of ‘Y’ 4 years hence from now will be 20% more than his present age, then ‘X’ is how many years younger than ‘Y’?

A boat takes 2 hours less to travel 240 km in downstream as compared to time taken by it to travel same distance in upstream. Find the speed of the boat in still water if its upstream speed is 60% of its downstream speed.

'A' and 'B' together can finish some work in 27 days. If 'A' alone can finish it in 45 days, then find the time taken by 'B' to finish the work alone.

A car takes 84 minutes to cover 112 km. If the speed of the car is decreased by 20 km/h, then find the time taken by the car to cover the same distance.