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

[Q]: Problem: what is the units digit of 26 ! + 50 ! + 4 ! + 4 ! ?
[A]: 8


[Q]: Problem: the ratio between the sale price and the cost price of an article is 12 : 7 . what is the ratio between the profit and the cost price of that article ?
[A]: 5 : 7


[Q]: Problem: in what time will a train 80 m long cross an electric pole , it its speed be 144 km / hr ?
[A]:
2.0 sec