SOLUTION: Fresh grapes contain 80% water by weight, whereas dried grapes contain 15% water by weight. How many pounds of dried grapes can be obtained from 34 pounds of fresh grapes?

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Question 319763: Fresh grapes contain 80% water by weight, whereas dried grapes contain 15% water by weight. How many pounds of dried grapes can be obtained from 34 pounds of fresh
grapes?
Found 2 solutions by josmiceli, Bikash1990:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
If you removed all the water from the fresh grapes,you
would have .2%2A34+=+6.8 pounds
But the problems says you must have 15% water, so
.2+%2B+.15+=+.35
.35%2A34+=+11.9
11.9 pounds of dried grapes

Answer by Bikash1990(1) About Me  (Show Source):
You can put this solution on YOUR website!
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.