Answer:
k = 16
Explanation:
Comment
Start with 8 times the sum of
Refine it down to the sum of what.?
5 + k
8(5 + k) is what you have so far
The next part of the sentence is equal to 120 or =120
Equation
8(5 + k) = 12
Solution
8(5 + k) = 129 Remove the brackets
40 + 8k = 120 Subtract 40 from both sides
40 - 40 + 5k = 120 - 40 Combine
5k = 80 Divide by 5
5k/5 = 80/5
k = 16