20% (1/5) survived. 80% (4/5) were lost. The number of surviving trees was (1/5)/(4/5) = 1/4 of the number lost.
Divide 10,800 by 4 for the answer
A tsunami destoyed 4 fifths of a forest. If 10,800 trees were lost how many trees survived?
Please include the steps.
2 answers
Here are two ways to do it:
(4/5) total = 10,800
total = (5/4)10,800 = 13,500
and
13,500 - 10,800 = 2,700
OR
1 - (4/5) = 1/5
if
(4/5)total = 10,800
then
(1/5) total = 10,800/4 = 2,700 again
(4/5) total = 10,800
total = (5/4)10,800 = 13,500
and
13,500 - 10,800 = 2,700
OR
1 - (4/5) = 1/5
if
(4/5)total = 10,800
then
(1/5) total = 10,800/4 = 2,700 again