Quantitative Aptitude - Arithmetic Ability Questions

The average marks of 40 students in an examination was 34. It was later found that the marks of one student had been wrongly entered as 62 instead of 26. what is the correct average?

If a vendor sells a coconut at Rs 24 he makes 20% loss. If he sells at Rs 36 then what is his profit percentage?

P and Q can do a project in 150 and 100 days respectively. In how many days can they complete 60% of the project if they work together?

If (x/y)a-4 = (y/x)2a-5, then what is the relation between x and y?

If 35% of A's income is equal to 25% of B's income, then the ratio of A's income to B's income is

If A = (-14 + 4) and B = 4 - 14, then AB = 

Three bottles of equal capacity containing mixture of milk and water in ratio 2 : 5, 3 : 4 and 4 : 5 respectively. These three bottles are emptied into a large bottle. What will be the ratio of milk and water respectively in the large bottle?

Find k, if the line 2x- ­3y = 11 is perpendicular to the line 3x + ky = -­4?