MBA Exam Numerical Ability Algebra

Find the sum of all the real values of x that satisfy the equation:{243^(log (base 81) x)} - 2x = {2^(log (base 16) x + 2} - 8.

1) 16
2) 20
3) 12
4) 18
5) NOT

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MBA Other Question

Using Alligations :Ravi lends Rs.3600 on S.I to Harsh for a period of 5 years.He lends a part of the amount at 4%interest and the rest at 6% and receives Rs.960 as the amount of interest.How much money did he lend on 4% interest rate?

1) 2800
2) 2100
3) 2400
4) 1200
5) 1000
How many pairs of natural numbers are there, the difference of whose squares is 39?

1) 1
2) 2
3) 3
4) 4