2 ms·

The basic proportion matching formula which is just a linear equation in disguise. a/b = c/d, we know a, b and c, solve for d, which is cb / a. As I s

by anthk 2y ago

The basic proportion matching formula which is just a linear equation in disguise. a/b = c/d, we know a, b and c, solve for d, which is cb / a. As I said, every grandma did that to guess some percentages. Thus, if anyone can grasp that, he/she is ready for Algebra.

lproven 2y ago
Never heard of this before, and no, I do not think my own mother could do this. Again: I think you badly underestimate how hard this stuff is.
- anthk 2y ago
  Ever? A book costs $20. How many books could you get with $200? That's it. Even my granma living in a remote village understood it.