Question

patio is 12ft by 15ft after remodeling new deck is 18ft by 22ft how many square ft have you increased

Answer 1

First of all we need to know that we are going to calculate the area of two squares:

The firstone:

$area=12\cdot15=180ft^2$

The secondone:

$\text{area}1=18\cdot22=396ft^2$

the diference was:

$396-180=216ft^2$

Finally, the answer is 216 square ft have increased.