Length, help me to find area

Question

A gry is an old English measure fir length, defined as 1/10 of a line, where line is another old English measure for length, defined as 1/12 inch. A common measure for length in the publishing bussiness is a point, defined as 1/72 inch. What is an area of 0,75 gry^2 in point squared?

Answer 1

Just multiply and cancel the units.

 

0.75 gry² x (0.1 line)²/(1 gry)² x (1 in)²/(12 lines)² x (72 points)²/(1 in)² = 0.27 point²