Hello!
First, we must divide the number of members of the service club (90) by 5 and then multiply that by 3 to find out how many of the 3/5 people voted:
90 ÷ 5 = 18
18 × 3 = 54
So, 54 members voted on Wednesday.
90 - 54 = 36
36 ÷ 4 = 9
9 members voted on Tuesday.
54 + 9 = 63
90 - 63 = 27
A N S W E R:
27 members did NOT vote at all.