Quantitative Aptitude - Arithmetic Ability Questions

If x2-2x+1=0,then the value of x4+1x4 is

If sin (3x ­ 20°) = cos (3y + 20°), then find the value of (x + y).

What is the value of x3-1x3+8 when 8x-8x-16=0 ?

If x + y = 12 and x2 + y2 = 94, then xy is 

Find the circumference (in cm) of a circle of radius 10.5 cm

A man is 3 years older than his wife and four times as old as his son. If the son becomes 15 years old after 3 years. Then what is the present age of the wife?

The average marks of 40 students in an examination was 25. It was later found that the marks of one student had been wrongly entered as 73 instead of 37. What is the value of correct average?

If a is positive and a2+1a2 = 7, then a3 + 1a3 = ?