Quantitative Aptitude - Arithmetic Ability Questions

(251+252+253+254+255) is divided by

A student multiplied a number by 6/7 instead of 7/6. What is the percentage error in the calculation?

What will come in the place of question mark (?) in the following question (You do not have to calculate the exact value)?

√(3099.985 ÷ 62.001 + 14.001) = ?

Makarand works 2 times as fast as Samarjit. If Samarjit can complete a job alone in 27 days, then in how many days can they together finish the job?

If a person has sold an article for Rs. 1300 and made a profit of 30%, find the cost price of the article.

If P = 7 + 4√3 and PQ = 1, then what is the value of (1/P2) + (1/Q2)?

P(3,1) and R(-7,5) are vertices of a rhombus PQRS. What is the equation of diagonal QS?

In an examination, 35% of total students failed in Hindi, 45% failed in English and 20% failed in both. Find the percentage of those studnets who passed in both the subjects ?