Question

What value of n makes the equation true?

0.7n + 0.8n = 2.1

A. n = 3.15
B. n = 0.60
C. n = 1.40
D.n = 3.60

Answer 1

0.7n + 0.8n = 2.1
1.5n = 2.1
=>n= 2.1/1.5= 1.4
So, the ans is C. 1.40

Answer 2

C. n=1.40

Explanation:

just substitute it in or solve for the equations to get the unknown variable