Can you do percentage?
Algebra
Level
3
A large watermelon weighted 20 kg with 96% of its weight being water is allowed to stand in the sun for a while and due to which some of its water evaporates, so that now only 95% of it is water. Its reduced weight(in kg) will be?
20
18
15
19.9
16
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
first situation: total weight = 20kg; % of water = 96%; weigth of water = p {1}
second situation: total weight = 20kg - x; % of water = 95%; weigth of water = p - x {2}
{1}: p = 20.96%
{2}:p - x = (20 - x).95%
OBS.: (x.1 = x.100%) or 100% = 1
{2}: 20.96% - x.100% = 20.95% - x.95%
=> 20.(96 - 95) = x.( -95 +100)
=> x = 20/5 = 4kg
reduced weight(in kg) = 20kg - x = 20kg - 4kg = 16 kg ;)