Quantitative Aptitude - Arithmetic Ability Questions

What is the average of all the one digit and two digit natural numbers?

Krish is 5 years younger than Parthiv. Eight years ago three times the age of Krish was 10 more than twice the age of Parthiv. Find Krish's present age?

ΔABC is an equilateral triangle and D, E are midpoints of AB and BC respectively. Then the area of ΔABC : the area of the trapezium ADEC is

Two men standing on same side of a pillar 75 metre high, observe the angles of elevation of the top of the pillar to be 30° and 60° respectively the distance between two men is

If sum of the roots of a quadratic equation is ­-7 and product of the roots is 12. Find the quadratic equation.

What is the value of x4+y4 when the value of x3+y3=8 and x+y=2 ?

If sinA + sin2A =1 then what is the value of cos2A + cos4A

What is the value of (cos45° + 1/3) ?