Answer:
26
Step-by-step explanation:
5 + 6 + 7 + 8 = 11 + 15 = 26
Hope it helps you in your learning process.
[tex]5+6+7+8\\\text {Add: }\\5+6+7+8\\11+7+8\\18+8\\\boxed {26}[/tex]
5+6+7+8 = 26
