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The average of n observations is 40. If one observation of value 80 is added, then the average of all the observation is 41. What is the value of n?
A train of length 212m is running at 45 km/h. In what time (in seconds) will it cross a platform of length 188m?
Two circle of radius 5cm and 3cm intersect each other at A and B, and the distance between their centres is 6cm. The length of the common chord AB is.
If a = 500, b = 502 and c = 504 then the value of a³ + b³ + c³ – 3abc ?
If 66⅔ % of 75% of one – eighth of a certain number is 179. Then 33⅓ % of three – fourth of that number is.
Surbhi spends 75% of her income. If her income increased by 20% and savings decrease by 1%, then the percentage increase in her expenditure is.
In ∆ABC, AD is the median and G is a point on AD such that AG : GD = 2 : 1, Then ar (∆BDG) : ar (∆ABC) is equal to.
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