If P(A) = 3/4 , what is the value of P(A)

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

What are the relative frequencies to the nearest hundredth of the columns of the two-way table? a b group 1 102 34 group 2 18 14

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?