Elitmus Exam Numerical Ability Log and Antilog

f(x)=logaX+logbXwhere1

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Elitmus Other Question

In the elitmus forum it's been found that out of all student 50% of student write in the forum out which 36% student write about 3 companies I.E. midntree, tintel , kosch and it's been found that the number of student that wrote about midntree is double of the number of student that write about tintel , which in turn is double of the number of students that write about kosch. And it's been known that number of student that wrote about kosch is 7560 than is the number of student present in the blog :
1- 126000
2- 156000
3- 168000
4- Can't be determined
Q)f(x)=log(base a)x + log(base b)x where 1