First press 3:1 to enlarge, then press 1:2 to reduce. What's the current area? What's the formula First press 3:1 to enlarge, then press 1:2 to reduce. What is the area now? What's the formula

First press 3:1 to enlarge, then press 1:2 to reduce. What's the current area? What's the formula First press 3:1 to enlarge, then press 1:2 to reduce. What is the area now? What's the formula

(1*3)/2=3/2