Arithmetical Reasoning 1.Algebra Level 3
At a farm , there are hens , cows and bullocks , and keepers to look after them . There are 69 heads less than legs ; the number of cows is double of that of the bullocks; the number of cows and hens is the same and there is 1 keeper per 10 birds and cattle . The total number of hens plus cows and bullocks and their keepers does not exceed 50 . How many cows are there ?