Question

a model of a bridge is 1 meter long and is 2.5% of the actual size of the bridge. How long is the actual bridge?

i tired to do 1 x 2.5% but its 2.5 so i don't think that is correct. help please?

Answer 1

2.5% = 0.025

Answer 2

I would set up a proportion

meters 1 x
---- --- ---
scale 2.5 100

(% means out of a hundred)

Since 25 x 40 = 100,
then 1 x 40 = 40

The bridge is 40m long.

Answer 3

thanks but how did you come up with that?

Answer 4

or

let the length of the bridge be x m
.025x = 1
x = 1/.025 = 40