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

Problem: calculate the share of z , if rs . 3720 is divided among x , y and z in the ratio 7 : 8 : 11 ?
1574.1

Problem: there are 2 red chips and 3 blue ones . when arranged in a row , they form a certain color pattern , for example rbrrb . how many color patterns ?
e ) 10

Problem: how many of the integers between 15 and 55 are even ?
20