If 6 pounds of grapes costs $1.89, how much would 15 pounds of grapes cost?

So divide 1.89 by 6 to see how much would one pound of grape be
1.89/6=0.315
Then multiply 0.315 (price for one pound of grape ) by 15
0.315*15 =4.725 $for 15 pounds of grape

The answer for this is 9/1253decimal form 0.007