instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: find the area of trapezium whose parallel sides are 20 cm and 18 cm long , and the distance between them is 20 cm ?
answer:
380 cm 2

question:
Problem: a certain bacteria colony doubles in size every day for 25 days , at which point it reaches the limit of its habitat and can no longer grow . if two bacteria colonies start growing simultaneously , how many days will it take them to reach the habitat ' s limit ?
answer:
2

question:
Problem: a number is doubled and 5 is added . if the resultant is trebled , it becomes 129 . what is that number ?
answer:
19