Quantitative Aptitude - Arithmetic Ability Questions

Triangle DEF is right angled at E. If cot D = 5/12, then what is the value of sin F?

Working 5 hours a day, Shivam can read a book in 24 days. How many hours a day should he work so as to finish the same work in 8 days?

The average of 21 numbers is 12. The average of the first 11 numbers is 9 and the average of the last 11 numbers is 15. What is the value of the middle number?

On selling 56 chairs, Mohan earns profit equal to the selling price of 6 chairs. What is the profit percentage?

The reciprocal of the sum of the reciprocals of 3/8 and 8/11 is:

What is the sum of the first 12 terms of an arithmetic progression if the first term is 3 and last term is 47?

The areas of two similar triangles ΔXYZ and ΔPQR are 100 sq cms and 25 sq cms respectively. If PQ = 4 cm then what is the length of XY (in cm)?

In a triangle PQR, ∠PQR = 90 deg, PQ = 10 cm and PR = 26 cm, then what is the value (in cm) of inradius of incircle?