At a farm there are hens,cows,bullocks and keepers to look after them . There are 69 heads less than legs ,no. of cows is double than that of the bullocks no. of hens is same as the no. of cows and there is 1 keeper per 10 birds and cattle. Total no. of hens +cows+bullocks and their keepers does not exceed 50. How many cows are there??
