Ruben is making a display that includes dinosaurs in their habitat. the dinosaurs will need to be decreased in size to fit the display.

80%

Step-by-step explanation:

"He will start with the Brachiosaurus which has an estimated height of 15 meters and make the model 3 meters on height. by what percent will Ruben decrease the size of the Brachiosaurus in order to fit it into the display"

The percent decrease is the difference in heights divided by the original height.

(15 - 3) / 15

12/15

0.8

So Ruben will decrease the size by 80%.

5/20 so 25%

step-by-step explanation:

10 - 75

step-by-step explanation:

there's nothing attached so it's most likely anything in that range.