If 80% is 72 marks, what is full marks

Leo has b boxes of pencils. each box contains 6 pencils. he has a total of 42 pencils. the equation that represents this situation the value of b that makes the equation true the first one is b+6=42,6b=42,b=42+6,or 42b=6 the second one are 7,836 48

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?