The scale model of a skyscraper being built is 4.2 feet tall

A) when it is finished, the skyscraper will be 525 meters tall. what scale was used to make the model

So convert from feet to meters

1 foot=12 in

1 meter=39 in

so x times foot=meter

x times 12=39

divide both sdies by 12

x=39/12

x=3 and 3/12 or 3 and 1/4 or 3.25

so 525 = (3.25 times 525) feet=1705.25 feet

so 4.2 to 1705.25

turn into fraction and simplify

1705.25/4.2=406.25/1

the ratio is 406.25:1