That depends on the size or weight of the apple and the banana. For the carbohydrate content of both, by size and weight, see the page links, further down this page, listed under Related Questions.
It depends on the size of the banana. For both the calories in banana and the carbohydrates in banana, by either size or cup measurement, please see the page links, further down this page, listed...
That depends on the size or weight of the banana. For the carbs and calories in banana by size or weight, see the page links, further down this page, listed under Related Questions.
The carb content depends on the weight or size. For the carbohydrates in both banana and potato, by weight or size, please see the page links, further down this page, listed under Related Questions.