Question

~~~15 POINTS~~~

Maria is 12 1/2 years older than Sal. The sum of their ages is 28 1/2. Which of the following equations can used to find their ages?

A. 28 1/2 - n = n/12 1/2

B. 28 1/2 - n = + 12 1/2

C. 28 1/2 + n = n + 12 1/2 - 28 1/2

D. 28 1/2 + n = 1(n - 12 1/2)

Answer 1

Let's call Maria 'M' and Sal 'S'

Maria is 12 1/2 years older than Sal.

S + 12 1/2 = M

The sum of their ages is 28 1/2

S + M = 28 1/2

Solve for M in the second equation:

28 1/2 - S = M

The first equation is:

S + 12 1/2 = M

Set them equal to each other since they both are equal to M.

28 1/2 - S = S + 12 1/2

Basicaly, n = S, so your correct answer is B. 28 1/2 - n = n + 12 1/2