Answer:
There are 48 red marbles.
Step-by-step explanation:
Total number of marbles = 72
Let the blue marbles be x.
Now, it has been given that there are twice as many red marbles as blue marbles. Hence, we have
Red marbles = 2x.
Hence, we have the equation
x + 2x = 72
3x = 72
x = 24
Hence, red marbles = 2 × 24 = 48
There are 48 red marbles.
