A woman owns stock in two companies, company A and company B. She owns 79 shares of stock in company A. Each share of stock in company A is worth $12. Each share of stock in company B is worth $19. Write three equations to represent the total number of shares of stock the woman owns. Use pencil and paper. Present at least one other way to show each of these three equations.

Question

Let b be number of shares of stock in company B the woman owns. Let T be the total number of shares of stock the woman owns. Which three equations below represent this situation?

A. 79b=T
B. 79+b=T
C. T−b=79
D. 12b=T
E. T−79=b
F. 12+b=T
G. T−12=b
H. T−b=12

Answer 1

If all we are interested in is the number of shares, all the info about their value is just noise.

a+b = T
a=79
79+b = T
b = T-79
a = T-b
b = T-a

and so on