The task is to generate the correct answer for a given math problem.

Problem: if a - b = 6 and a 2 + b 2 = 50 , find the value of ab .
a ) 7

Problem: a train 200 m long can cross an electric pole in 5 sec and then find the speed of the train ?
144

Problem: the population of a city increases by 4 % per year but due to migration it decrease by 1 % per years . what will be the percentage increase in population in 3 years ?

9.27 %