Quantitative Aptitude - Arithmetic Ability Questions

If 3x2 + kx + k = 0 has no solution, then the value of k will satisfy

The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is :

Read the data given below and answer the questions based on it.

In the CBSE Board exams last year, 53% passed in Biology, 61% percent passed in English, 60% in Social studies, 24% in Biology and English, 35% in English and social studies, 27% in Biology and social studies and 5% in none.

What is the percentage of students who passed in all subjects?

A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is : 

Find the odd man out of the series?

128, 32, 14, 2.66, 0.88

A and B are partners in a business. A contributes 1/4 of the capital for 15 months and B received 2/3 of the profit. For how long B's money was used ?

Find the unit place digit in the expression $$\begin{gathered} (159)144 + (114)123 - (110)510 + (213)25 \\ \end{gathered}$$

Correct expression of 0.12636¯ = ?