Question 319763
80% of the weight of the fresh grapes is water, so 20% is not water.

    20% × 34 pounds = 6.8 pounds of totally waterless grapes.

"Dried" grapes contain 15% water. So 85% of the weight of "dried" grapes is not water.

    85% × DGW = 6.8 pounds, where DGW is the dried grape weight.

So DGW = 6.8 pounds / 85%. The equivalent weight in "dried" grapes is 8 pounds.