It is known that α is an acute angle, and Tan (90-α) =, then the degree of α is () A.30 B.45 C.60 D.75 Answer A 10 bags of wheat are counted as per bag 150kg, and the excess kilograms are counted as positive, and the deficiency kilograms as negative. What is the total mass of 10 bag of wheat? What is the average quality of each bag of wheat? Answer 149.8