The instructions state that Cheryl needs 3/8 square yards of one type of material and 1/3 square yards of another type of material for a project. She buys exactly that amount. After finishing the project, however, she has 15/40 square yards left that she did not use. What is the total amount of square yards of material Cheryl used?  Choose the correct choice.
A) 1/12	B) 1/9	C) 2/3	D) 1/3	E) 2 1/9
total bought = 3/8+1/3   left part 15/40---&gt;3/8   so used part 3/8+1/3-3/8=1/3   Ans 1/3
<result>D</result>
The instructions state that Cheryl needs 3/8 square yards of one type of material and 1/3 square yards of another type of material for a project. She buys exactly that amount. After finishing the project, however, she has 15/40 square yards left that she did not use. What is the total amount of square yards of material Cheryl used?