a man has some hens and cows . if the number of heads be 48 and the number of feet equals 136 , then the number of hens will be :
"let hens be x and cows be y now , feet : x * 2 + y * 4 = 136 heads : x * 1 + y * 1 = 48 implies , 2 x + 4 y = 136 and x + y = 48 solving these two equations , we get x = 28 and y = 20 therefore , hens are 28 . answer : e"
divide(subtract(multiply(48, const_4), 136), const_2)