Quantitative Aptitude - Arithmetic Ability Questions

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)

Select the odd word/letters/number/number pair from the given alternatives.

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?

The equation of a line is given by 4y-6x+9=0. Find the slope of other line which is perpendicular to it.

Let O be the orthocentre of the triangle ABC. If ∠BOC = 150°, Then ∠BAC is

Present age of A is 2 times the present age of B. After 8 years the B's age will be 4 times of C's present age. If C celebrated his fifth birthday 9 years
ago, then what is the present age (in years) of A?