Quantitative Aptitude - Arithmetic Ability Questions

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

The average marks of 56 students is shown as 60. It includes a wrong entry of 92 marks instead of 29 marks. The correct average is _____ .

What is the unit place digit in the expansion of  773?

If a2+b2+c2=83and a+b+c=15 then the value of ab+bc+ca is

The height of the equilateral triangle is 9 cm. What is the radius (in cm) of the circle circumscribing the three vertices?

Ravi had five subjects in his final examination. The maximum marks in each subject are 100. If his percentage in four subjects is 80, and he scores 65 marks in the fifth subject, determine his overall percentage for the five subjects.

In ∆ABCif the median AD=1/2 BC, then ∠BAC is

PQRS is a cyclic quadrilateral and PQ is the diameter of the circle. If ∠RPQ = 38°, then what is the value (in degrees) of ∠PSR?