Yolanda's club has 35 members. Its rules requires that 60 percent of them must be present for any vote. At least how many members must be present to have a vote

21

Step-by-step explanation: We can rewrite this problem as:

What is 60% of 35?

"Percent" or "%" means "out of 100" or "per 100", Therefore 60% can be written as 60/100

When dealing with percent's the word "of" means "times" or "to multiply".

Finally, lets call the number of members we are looking for "m".

Putting this altogether we can write this equation and solve for  

m

while keeping the equation balanced: m=60/100*35

m=2100/100

m=21