If m + n = 1, then what will be the value of m³ + n³ + 3mn?

Direction: What value will come in place of the question mark (?) in the following question?

2.4, 3.6, 5.1, 6.9, ?, 11.4

If the height is doubled and the base is decreased by 20%, then the ratio of old area of the triangle and new area of the triangle is –

The price of an article is raised by 30% and then two successive discounts of 10% each are allowed. Ultimately the price of the article is

The value of   $${cosθ+sin^6θ+3sin^2θ \ cos^2θ}\over cosecθsecθ(sinθ+cosθ-1)(sinθ+cosθ+1) $$

If the price of a commodity is decreased by 20% and its consumption is increased by 20%, what will be the increase or de- crease in the expenditure on the commodity?

The price of sugar is reduced by 20%. Now a person can buy 500g more sugar for ₹ 36. The original price of the sugar per kilogram was: 

If x = 2 then the value of x³ + 27x² + 243x + 631 is