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

Ex Input:
Problem: bob wants to run a mile in the same time as his sister . if bob ’ s time for a mile is currently 11 minutes 20 seconds and his sister ’ s time is currently 9 minutes 36 seconds , by what percent does bob need to improve his time in order run a mile in the same time as his sister ?

Ex Output:
15 


Ex Input:
Problem: in a forest 150 deer were caught , tagged with electronic markers , then released . a week later , 50 deer were captured in the same forest . of these 50 deer , it was found that 20 had been tagged with the electronic markers . if the percentage of tagged deer in the second sample approximates the percentage of tagged deer in the forest , and if no deer had either left or entered the forest over the preceding week , what is the approximate number of deer in the forest ?

Ex Output:
6,000


Ex Input:
Problem: a is twice as good a work man as b and together they finish the work in 4 days . in how many days a alone can finish the work ?

Ex Output: