Q3:Material A costs $3 per kilogram, and material B costs $5 per kilogram.  If 10 kilograms of material K consists of x kilograms of material A and y kilograms of material B, is x > y?

(1)   y > 4

(2)   The cost of the 10 kilograms of material K is less than $40.      3x+5y<40

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient

答案B,但是这人并没有说x,y为intergers，所以应该为E?

不太同意楼主

3x+5y<40  推出  3x+5(10-x)<40

经过计算x>5

由x+y=10推出y〈5

所以x>y