(77+83+89+86+x)/5=85 (335+x)/5=85 (335+x)=85*5 335+x=425 x=425-335 x=90 He must get 90% on his fifth test to average 85%.
83 percent of 335 is 278.05
30 percent of 335 is 100.5
20% of 335 = 20*335/100 = 67
335*0.62=207.7
335% = 67/20
335% = 3.35
335 over 100
It is: 335-201 = 134
335 - 30% = 234.5
.35 x 335 = 117.25. Therefore, 35% of 335 is 117.25.
335 x 15% = 50.25