A tree is 78 feet tall and grows 7 feet per year. A second tree is 111 feet tall and grows 4 feet per year.

In how many years will the trees be the same height?

A tree is 78 feet tall and grows 7 feet per year. A second tree is 111 feet tall and grows 4 feet per year.

In how many years will the trees be the same height?

X = number of years

78 + 7x = 111 + 4x

-78 from both sides

7x = 33 + 4x

Subtract 4x from both sides

3x = 33

Divid both sides by 3

X= 11

In 11 years both trees will be the same height.

In 11 year’s each tree will grow to the same height