Question in My Son's Math Training Worksheet that Has Me Completely Baffled

Question

I am not sure what title to put as the question really has both me and my son confused. It says this:

"If PLUS equals 68, what does MINUS equal?"

and the choices are:

A. 102 B. 76 C. 120 D. 46

and the answer provided in the answer key was 76.

Maybe someone here has encountered some problem with a similar logic? We are utterly confused at where to start with the solution and have tried researching about inverse, etc.

Hoping someone can help with this. Thanks :)

Answer 1

Sum up the positions of the letters in the alphabet beginning with

• $A = 1 \Rightarrow$ $$PLUS = P+L+U+S = 16+12+19+21=68$$