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