Select the correct answer.

Question

The sum of two consecutive numbers is 157. This equation, where n is the first number, represents the situation:

2n + 1 = 157.

What is the first number?

A.
77
B.
78
C.
79
D.
80

Answer 1

Let's solve the equation given:

The equation is: $$2n+1=157$$

To find $n$, we will first isolate $2n$:

1. Subtract 1 from both sides: $$2n=157-1$$ $$2n=156$$

2. Now, divide both sides by 2 to find $n$: $$n=\frac{156}{2}$$ $$n=78$$

So, the first number is 78.

The correct answer is: B. 78