Question

4 and 8/10 divided by 4/5

Answer 1

Change 4 and 8/10 into an improper fraction:
((4*10)+8)/10 = 48/10
When you divide fractions, you take the reciprocal (flip) the divisor (the number you're dividing by) and multiply it by your dividend.
In your case, 48/10 / 4/5 = 48/10 * 5/4 = (48*5)/(10*4) = 240/40 = 6