instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: the sum of the even numbers between 1 and n is 89 * 90 , where n is an odd number , then n = ?
answer:
179


question:
Problem: in a village of 2,500 people , 800 people are over 70 years old and 850 people are female . it is known that 40 percent of the females are younger than 70 years old . if no one in the village is 70 years old , what is the probability that a person chosen at random is either a male or younger than 70 years old ?
answer:
199 / 250


question:
Problem: a 90 cm long wire is to be cut into two pieces so that one piece will be 2 / 5 th of the other , how many centimeters will the shorter piece be ?
answer:

25