If 70% of the members remembered the password but 21 members forgot, than how many members were there in all????
21 / .30 = 21 X 100/ 30 = 2100 / 30 = 70 members in all
Proof
49 remembered = 70% of 70
21 forgot = 30% of 70
Let the number of members be m, then we have:
.70m + 21=m
21=m - .70m
21=.30m divide both sides by .30
m=21/.30
m=70 total number of members.
