1 answer
(click or scroll down)
To find the area of the postcard, we need to first find the width of the resized photo.
Using the ratio of the sides of the original photo, we can find the width of the resized photo:
6cm / 4cm = x / 15cm
x = 15cm * (6cm / 4cm)
x = 22.5cm
Now we can find the area of the postcard by multiplying the length and width:
Area = 15cm * 22.5cm
Area = 337.5 square centimeters
Therefore, the area of the postcard will be 337.5 square centimeters.