As you are a visual learner, you have a bias towards learning via pictures or diagrams. Try to take notes that include diagrams, or try using a mind map and visualise things.
This is an easy question. you just have to divide. 420÷6.82= 61.5 but because they are individual stocks and you can't have half a stock, you round it up to the nearest whole number so the answer is 61 hope I helped:)