There are \({x}\) cows, \({y}\) bulls, \({z}\) hens, in a Farm. One stockman* can take care of 15 animals. It is stated that \({z} = 45\).

The number of cows is half the number of bulls.

If total number of **heads** in the farm is less-than total number of **legs** (or feet) by 186 (including the stockman), the total number of **stockman** in the farm is?

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