David's age is four times alisa’s age. in eight years, david will be twice as old as alisa. how old is each now?

Alissa's current age = 4

David's current age = 16

Step-by-step explanation:

if say Alissa is x years old then David is 4x years old

in 8 years Alissa will be x+8, and David 4x+8 and that's twice as Alissa's age therefore:

2×(x+8)=4x+8

2x+16 = 4x+8

16-8=4x-2x

8=2x

x=4

14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.