If $$ {0.7\over 1-6c}=-0.2$$ then what is the value of c.

A dealer marks an article 40% above the cost price and sells it to a customer, allowing two successive discounts of 20% and 25% on the marked price. If he suffers a loss of Rs.140, then the cost price (in Rs.) of the article is:

If x + y = 1 and xy (xy – 2) = 12,then the value of x⁴ + y⁴ is:

The following table shows the number of units of product produced and sold by a company over the course of six years.

In which year, the production of product units is about 31.4 percent less than the units sold in 2017?

Direction: Study the following information and answer the related questions. P, Q, R, S, T, A, B, C, D and E are employees of a company. A table shows the average age of any two employees of the company. The average age of A and B is 27.5.
i.e. average age of A & P is given as (A+P)/2=39.5

What is the age of T?

The value of sin²22° + Sin²68°+ Cot² 30° is:

If A : B: C= 2 : 3 : 4, then $$ {A\over B}:{B\over C}:{C\over A}$$ is equal to 

Rs. 1,080 invested for 3 months gave an interest of Rs. 27. The simple rate of interest per annum was :