Quantitative Aptitude - Arithmetic Ability Questions

If a - b = -7 and a2+ b2= 85, then find ab.

Coefficient of x2in (x + 9)(6 - 4x)(4x - 7) is

The average of 100 observations was calculated as 35.It was found later, that one of the observation was misread as 83 instead of 53. The correct average is :

If a(x + y) = b(x - y) = 2ab, then the value of 2(x2 + y2)

In new government policy, the price of onion is raised by 35%. By what % should a person reduce onion consumption so that the expenditure on it does not increase?

A line passing through the origin perpendicularly cuts the line 2x + 3y = 6 at point M. Find M?

Product of 6ab, 3b and 4a is

In a farm, in addition to 48 hens there are 42 sheep and 11 oxen with some shepherds. If the total number of feet be 224 more than the number of heads, find the number of shepherd.