Quantitative Aptitude - Arithmetic Ability Questions

If by selling an article for Rs. 390 a shopkeeper gains 20% , then the cost is

A batsman has a certain average of runs for 12 innings. In the 13th inning he scores 96 runs thereby increasing his average by 5 runs. What will be his average after 13th inning?

Find the odd one out.

Select the odd word/letters/number/number pair from the given alternatives.

When a number is increased by 21, it becomes 114% of itself. What is the number?

The areas of a circle and square are equal. What is the square of the ratio of length of diameter to the length of diagonal?

If the speed of a boat in still water is 20 km/hr and the speed of the current is 5 km/hr, then the time taken by the boat to travel 100 km with the current is

If A : B = 1 : 4 and B : C = 2 : 3, then what is A : B : C?