Answer: 665 calories.
Step-by-step explanation:
Let x be the number of calories in a banana split.
Given : A banana has 90 calories. This is 5 calories less than one seventh of calories in a banana split.
Then, According to the above statement , we have the following equation :-
\(\dfrac{1}{7}x-5=90\)
Adding 5 on both sides , we get
\(\dfrac{1}{7}x=95\\\\\Rightarrow x=7\times95\\\\\Rightarrow\ x= 665\)
Hence, there are 665 calories in a banana split .
