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

[Q]: Problem: find the cost of fencing around a circular field of diameter 16 m at the rate of rs . 3 a meter ?
[A]: 150.84

[Q]: Problem: a and b invests rs . 10000 each , a investing for 6 months and b investing for all the 12 months in the year . if the total profit at the end of the year is rs . 24000 , find their shares ?
[A]: 8000

[Q]: Problem: evaluate : 19 + sqrt ( - 2 + 12 a 6 a 9 ) = ?
[A]:
55