SSC CGL new vacancy 2020 has been out.
One of the most scoring topics for SSC CGL 2020 is quantitative aptitude.
Mock test in Hindi can also help you to practice more and score well.
SSC CGL 2020: Percentage
Percentage (%) is a fraction or ratio where denominator is 100.
( x * n)/100
Example: 20% of 150 is (20*150)/100 =30
Example: 20% of 5= 5% of 20
(n / x)*100
x (1+ n/100)
(N/ (100 + N)) * 100 %
Population after n years = P*(1 + R/100) n
Population before n years = P/ (1 + R/100) n
Price of commodity after n years = P*(1 - R/100) n
Price of commodity n years ago = P/ (1 - R/100) n
SSC CGL 2020: Ratio and Proportion
Ratio(x/y) is the relation between two or more values of same kind.
Where x is antecedent and y is consequent.
For example: x: y is not same as y: x.
Proportion (::) is when ratio of first and second element is equal to third and fourth element.
A: B = C: D
For example: 4:10:: 8: 20=2/5
Fourth Proportional (D) = (B*C)/ A
Third proportional (C) = B2/A
SSC CGL 2020: Speed, Distance & Time
Speed in km/hr or m/sec or miles/ hr.
Distance in Km or meter or miles.
Time is in hours or minutes or seconds.
Km/hr to meter/ sec = speed in km/hr* 5/18
Meter/sec to km/hr= speed in m/sec* 18/5
Average speed = (2xy)/(x + y)
Relative speed = difference of x and y
Relative speed = addition of x and y
Average speed = (x + y)/2
Average speed = 2x*y/ (x + y)
Speed of A/ Speed of B=√Time taken by B/ Time taken by A