Trigonometry special trick

PERMUTATION QUESTION FOR BANK PO/CAT

IMPORTANT FOR CAT/PLACEMENTS

     Seventy percent of the employees in a multinational corporation have VCD players, 75 percent have microwave ovens ,80 percents have Acs and 85 percent have washing machines .At least what percent of employees has all four gadgets ?

solution

The least percentage of people with all 4 gadgets would happen if all the employees who are not having any one of the four objects is mutually exclusive thus 100-30-25-20-15=10

Let us call the people P1, P2, P3... P100

P = 30 people don't have VCD. Let them be P1, P2.. P30

Q = 25 people don't have ovens. Let them be P31, P32, P33... P55

R = 20 people don't have ACs. Let them be P56, P57, P58... P75.

S = 15 people don't have Washing Machines. Let them be P76, P77... P90.

Now, P91, P92... P100 have everything. So, 10 people have everything.

If you make some people common in P, Q, R, and S; then the number of people who have everything will be more that 10.

=> The minimum number of people who have everything is 10.

Trigonometry important trick

Time and Work Important trick

This is again a very important question asked in many aptitude exams

Two men undertake to do a piece of work for Rs 1400. First man alone can do this work in 7 days while the second man alone can do this work in 8 days. If they working together complete this work in 3 days with the help of a boy, how should money be divided?

So funda is money is divided according to work performed  so first man in 3 days will be able to do 3/7 of work in 3 days o 3/7 of 1400 is   Rs 600

 Second man can do 3/8 of work in 3 days 3/8 of 1400 is  Rs 525

and rest money should be given to boy  1400-600 -525= Rs 275

TIME AND WORK IMPORTANT QUESTION WITH A LOGICAL THINKING TRICK

Today i want to discuss a very important question asked in many exams SSC CGL/BANK PO/ AFACAT /MBA solution of this question is given by very long method in many books 

Two typists of varying skills can do a typing job in 6 minutes if they work together. If the first typist typed alone 4 minutes and then the second typist typed alone for 6 minutes, they would be left with 1/5 of the whole work. How many minutes would it take the slower typist to complete the typing job working alone?

now think logically they both can complete the work in 6 minutes now the first typist typed alone 4 minutes and then the second typist typed alone for 6 minutes, it means if first typist work 2 more minutes after 4 minutes the work will be completed it means he can do 1/5th of work in 2 minutes so whole work in 5 * 2 = 10 minutes it means first can do the work alone in 10 minutes and together it is given in the question they complete the work in 6 minutes so you can easily calculate by basics of time & work that he will complete a work alone in 15 minutes. i.e. our answer that slower typist can complete the work in 15 minutes. 

VERY IMPORTANT CONE CUTTING SSC CGL 2015 MAINS QUESTION WITH 5 SECONDS TRICK

    This question was asked in SSC CGL  2015 mains so I derived a trick for this from similarity hope you like this trick

Question

If a plane divides a cone in two parts of equal volume if the plane parallel to base then ratio, in which height of cone is divide?

SSC CGL DOUBTS BY STUDENTS

 so it is our answer 

ALGEBRA SSC CGL DOUBT BY STUDENTS

     This is very important algebra question i am posting with my own unique trick if you master these tricks you can solve  SSC  CGL ALGEBRA QUESTIONS with this trick in few seconds 

SSC CGL DOUBT BY STUDENTS

Three men A, B and C working together can do a job in 6 hours less time than A alone, in 1 hour less time than B alone and in one half the time needed by C when working alone. Then A and B together can do the job in 

so you can use these two tricks and methods