Question

63. If fresh grapes contain 95% water, and
dry grapes contain 5% water, how many
kilograms fresh grapes are required to
get 400 gm of dry grapes ?
(1) 7.6 kgms
(2) 8 kgms
(3) 8.2 kgms
1600
15 ano
12
OF Iso
O.​

Answer 1

Let’s assume 100kg of grapes. If they’re are 95% water, then they are 5% grape, or:

100 x .05=5

If the water content drops to 90%, then that 5 kg becomes 10% of the content. Let n be the weight of the grapes after the water content has fallen. Then:

.1n=5

n=5/.1

=50 kg of grapes………..