84% of 50 is 42. So if your test was graded out of 50 you would've gotten 42/50. If you multiply 50 by 2 (50x2), you have 100, so then you'd just divide the 84% by 2 so you'd get 42%
3 weeks = 21 days Let Jerrad's vacation be X then Max's be 2X and Wesley's 4X X+2X+4X=21 7X=21 devide by 7 X=3 so Jerrad had 3 days vacation 2*3= 6 Max had 6 days 4*3=12 Wesley had 12 days vacation