Lea bought seven posters a week later half of her posters were destroyed in a fire there are now only 18 posters left with how many did she start ?

In the given question it is mentioned that Lea bought 7 posters . Half of the posters she collected got burnt by fire a week later. Lea is left with only 18 posters.
let us assume that the number of posters Lea had in the beginning = x
The number of posters she had after fire burn = x/2.
Now we can come to the required equation
x/2 = 18
x = 18 * 2
x = 36
x = 36
 So it can be stated that Lea started with 36 posters. the severn posters stated here in the question has no importance at all. It is just there to puzzle.

The reporter forgot to multiply the decimal by 100, making it 25%