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

[Q]: Problem: a and b can together finish a work in 40 days . they worked together for 10 days and then b left . after another 15 days , a finished the remaining work . in how many days a alone can finish the job ?
[A]: 2

[Q]: 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 ?
[A]: e ) 10

[Q]: Problem: a numberais squared and then multiplied by negative 3 . the result of this operation r is equal to 3 times the sum of 3 timesaand two . what is one possible value ofa ?
[A]:
- 2