Question

a town had about 2120 acres of pine trees 40 years ago. Only about 13% of the pine trees remain. How many acres of pine trees remain

Answer 1

$13/100 = x/2120 \\ 100*x = 13*2120 \\ 100x = 27,560 \\ 100x/100 = 27560/100 \\ x = 275.6$
275.6 acres of pine trees remain.

Answer 2

.13*2120=275.6

x=275.6 acres