A bag contains 56 marbles. The ratio of red marbles to the total number of marbles is 3 : 8. How many marbles are NOT red?
Show Worked Solution
Worked Solution
Step 1: Identify what 8 units represents. 8 units = total marbles = 56.
Step 2: Find 1 unit. 1 unit = 56 ÷ 8 = 7 marbles.
Step 3: Find marbles that are NOT red. Not-red = 8 − 3 = 5 units, so not-red = 5 × 7 = 35 marbles.
Answer: 35
Correct answer: 35
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