A jar contains only red and blue marbles in a ratio of 4:9. If there are 45 blue marbles, how many red marbles are there?

Correct answer

C. 20

Explanation

The ratio 4:9 means for every 9 blue marbles there are 4 red. 45 blue ÷ 9 = 5 groups, so red marbles = 4 × 5 = 20.

Related MCQs

• If a company's revenue increased by 20% to reach ;000; what was the original revenue?
• A train travels 240 miles in 4 hours. At the same rate; how long will it take to travel 360 miles?
• Identify the logical flaw in this argument: "Every successful entrepreneur dropped out of college; so dropping...
• If x and y are positive integers and 3x = 5y; which of the following could be the value of x?
• A store marks up an item's cost by 40% to set the selling price. If the selling price is ; what was the ori...
• If the average of 5 consecutive integers is 14; what is the largest integer?