Question

A bag contains 100 marbles which are red, green, and blue.

Suppose a student randomly selects a marble without looking,
records the color, and then places the marble back in the bag.
The student has recorded 7 red marbles, 2 green marbles and
11 blue marbles. Predict how many blue marbles are in the
bag.
Voir can earn 5 coins

Answer 1

Answer: 2

Explanation:

Answer 2

Explanation:

Remark

The ratio you would use is 7 to 2 to 11

The question is what you you have to multiply these ratios by so the products when added come to 100?

Equation

7*x + 2*x + 11*x = 100 Combine the terms on the left

Solution

20x = 100 Divide both sides by 20

20x/20 = 100/20

x = 5

• Red: 7 * 5 = 35
• Green: 2 * 5 = 10
• Blue: 11*5 = 55
• Total 100

Answer: 55 blue marbles were in the bag.