[PDF] SSC CHSL Percentage Quick Maths Formulas





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SSC CHSL Percentage Quick Maths Formulas

1. Percentage = [Value / Total Value * 100]

2. If two values are respectively x% and y% more than a third value, then the first

is the (100+x) / (100+y) *100% of the second.

3. If A is x% of C and B is y% of C, then A is x/y*100% of B.

4. x% of quantity is taken by the first, y% of the remaining is taken by the second

and z% of the remaining is taken by third person. Now is A is left in the fund then there was (A*100*100*100) / (100-x) (100-y) (100-z) in the beginning.

5. x% of quantity is added. Again y% of increased quantity is added. Again z% of

the increased quantity is added. Now, it becomes A, then the initial amount is given by (A*100*100*100) / (100+x) (100+y) (100+z)

6. If the original population of a town is P and the annual increase is r%, then the

population in n years will be ʹ

P + P*r/100 = P*(1+r/100)

7. The population of a town is P. It increases by x% during the 1st year, increases

by y% during the 2nd year and again increases by z% during the third year.

Then, the population after 3 years will be -

P*(100+x)(100+y)(100+z) / 100*100*100

8. When the population decreases by y% during the 2nd year, while for the 1st

and 3rd years, it follows the same, the population after 3 years will be ʹ

P*100+x)(100-y)(100+z) / 100*100*100

9. If the price of a commodity increases by r%, then the reduction in

consumption so as not to increase the expenditure, is (r/100+r) * 100%

10. If the price of a commodity decreases by r%, then the increase in

consumption so as not to decrease the expenditure, is (r/100-r) * 100%

11. If the first value is r% more than the second value, then the second is

(r/100+r) * 100% less than the first value.

12. If the first value is r% less than the second value, then the second is (r/100-r)

* 100% more than the first value.

13. If the value of a number is first increased by x% and later decreased by x%,

the net change is always a decrease which is equal to x% of x or x2/100.

14. If the value of a number is first increased by x% and later decreased by y%,

then there is [x-y-(x*y/100)] % increase or decrease, according to the =ve or ʹ ve sign respectively.

15. If the order of increase and decrease is changes, the result remain

unaffected.

16. If the value is increased by x% and y% then the final increase is

[x+y+(x*y/100)] %.

17. If the price of a commodity is diminished by x% and its consumption is

increased by y% Or If the price of a commodity is increased by x% and its consumption is decreased by y% Then the effect on revenue is = [Inc. % Value ʹ Dec. % Value ʹ (Inc. % Value *

Dec. % Value/100)].

18. The passing marks in an examination is x%. If a candidates who scores y

marks, fails by z marks, then the max marks ʹ

M = 100*(y+z)/x.

Then the max marks for the exam are -

M = 100*(a+b) / (y-x).

20. In measuring the sides of rectangle, one side is taken x% in excess and the

other y% in deficit. The error % in area calculated from the measurement is [x

ʹ y - (x*y/100)].

21. If the sides of triangle, rectangle, square, circle, rhombus are increased by x%,

then its area is increased by [x * (x+200) / 100] % or [2*x + (x2/100)] %.

22. In an exam x% students failed in English and y% students failed in Maths. If z%

of students failed in both, Then the % of passed students in both subjects is = 100 ʹ (x + y - z) or (100-x) + (100-y) + z.quotesdbs_dbs47.pdfusesText_47
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