math
posted by Anonymous on .
An image on a slide is similar to it's projected image. A slide is 35 mm wide ande 21 mm high. It's projected image is 85 cm wide. To the nearest centimeter, how high is the image?

35/21 = 85/x
What I did was put the width of the images on the numerator of the fraction.
Multiply both sides by 21x to get rid of the denominators. We will have:
35x = 1785
Can you solve it from there? 
51 cm