Total - 19

Problems on Ages (Quick Tips and Tricks)
1) If the current age of a person be X, then
- age after n years = X + n
- age n years ago = X – n
- n times the age = nX
- If ages in the numerical are mentioned in ratio A : B, then A : B will be AX and BX
2) If sum of ages...

Published: 28 Sep 2019

For Practive use this Exercise https://gyangossip.com/average-test-part-1/mock-test/T12405

Published: 26 Sep 2019

1. Numeral : In Hindu Arabic system, we use ten symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, called digits to represent any numbers.
A group of digits, denoting a number is called a numeral.
We represent a number, say 689745132 as shown below :
We read it as : ‘Sixty- eight crores,...

Published: 12 Aug 2019

The Chain Rule is a formula for computing the derivative of the composition of two or more functions. For instance, if f and g are functions, then the chain rule expresses the derivative of their composition.
The Chain Rule Formula is as follows –
dy/dx = dy/du * du/dx
...

Published: 12 Aug 2019

Time and Work involves dealing with the rate at which individuals or group of people work. Conventionally we start by assuming the number of days (T) taken by a single person to complete a certain task where the rate of work of the person, or the amount of work the person can do in one day, is ...

Published: 12 Aug 2019

The problems of pipes and cisterns usually have two kinds of pipes, Inlet pipe and Outlet pipe / Leak.
Inlet : A pipe connected with a tank or a cistern or a reservoir, that fills it, is known as an inlet.
Outlet : A pipe connected with a tank or a cistern or a reservoir, emptyi...

Published: 12 Aug 2019

1. Basics
Speed = Distance / Time
Time = Distance / Speed
Distance = (Speed × Time)
2. Convert kilometres per hour(km/hr) to metres per second(m/s)
x km/hr = x * 5/18 m/sec
3. Convert metres per second(m/s) to kilometres per hour(km/hr)
x m/sec = x * 18...

Published: 12 Aug 2019

1. a km / hr = (a * 5/18) m/s.
2. a m / s = (a * 18/5) km / hr.
3. Time taken by a train of length / meters to pass a pole or a standing man or a signal post is equal to the time taken by the train to cover 1 meters.
4. Time taken by a train of length / meters to pass a stationary obje...

Published: 12 Aug 2019

1. In water, the direction along the stream is called downstream. And the direction against the stream is called upstream.
2. Let the speed of a boat in still water be u km/hr and the speed of the stream be v km/hr, then
Speed downstream = (u + v) km/hr
...

Published: 12 Aug 2019