"Carbohydrate quantity" refers to the amount of carbohydrates, which are energy-providing nutrients found in food. It simply means how much carbohydrates are present in the food or how many carbs you consume. Full definition
Before and after exercising you need to have sufficient carbohydrate quantity of 25 up to 50 grams, but they can be added to other meals as necessary. (fitnessandpower.com)
Also, carbohydrate quantity in fruits is lesser than in cereals and may not be enough as a sole source of energy before an intense weight training workout. (bodybuilding-wizard.com)
I've even included tables on protein, fat and carbohydrate quantities for a variety of the most common foods you'll be enjoying. (leanerbydesign.com)