A jar contains only red and blue marbles in a ratio of 6:8. If there are 40 blue marbles, how many red marbles are there?

Correct answer

D. 30

Explanation

The ratio 6:8 means for every 8 blue marbles there are 6 red. 40 blue ÷ 8 = 5 groups, so red marbles = 6 × 5 = 30.

Related MCQs

• If a car travels at 60 miles per hour; how far does it travel in 2.5 hours?
• What is the slope of a line passing through the points (2; 3) and (6; 11)?
• Choose the best transition word for the sentence: "The experiment failed twice; ___; the team refused to give...
• A weather balloon rises at a constant rate. If it reaches 500 feet after 4 minutes; what is its rate of ascent...
• In a controlled experiment; what is the primary purpose of a control group?
• If 2/5 of a number is 40; what is the number?