TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: the dimensions of a room are 25 feet * 15 feet * 12 feet . what is the cost of white washing the four walls of the room at rs . 7 per square feet if there is one door of dimensions 6 feet * 3 feet and three windows of dimensions 4 feet * 3 feet each ?

SOLUTION: s . 6342

PROBLEM: Problem: a train 140 m long is running at 60 kmph . in how much time wiu it pass a platform 260 m long ?

SOLUTION: 24 sec

PROBLEM: Problem: the average age of a class of 20 students is 18 years . the average increased by 2 when the teacher ' s age also included . what is the age of the teacher ?

SOLUTION:
40 years