Percentages

• To express x as a percentage of y, percentage =
• x % of a given quantity =
• If x % of a given quantity is y, then quantity =
  

Example: In a bag there are 6 blue marbles, 4 red marbles and 5 green marbles. What percent of total marbles are blue?

Solution: Total number of marbles = 6 + 4 + 5 = 15

Number of blue marb…