There are 64 blue and red marbles in a box. The ratio of red marbles and blue marbles is 3:5. How many blue marbles are there?

Plz Help me I'm stuck on this question!!!

total marbles=64

ratio of red and blue marbles=3:5
let the red marbles=3a
then,the blue marbles=5a
so,
3a+5a=64
8a=64
a=64/8
a=8
then the blue marbles=5×8
=40

Thx Anaji

To find the number of blue marbles, we need to use the ratio between the red and blue marbles. In this case, the ratio of red marbles to blue marbles is given as 3:5.

Step 1: Calculate the total number of parts in the ratio.
- In this case, there are 3 parts for the red marbles and 5 parts for the blue marbles, totaling 3 + 5 = 8 parts.

Step 2: Determine the value of each part.
- Divide the total number of marbles by the total number of parts.
- In this case, divide the total number of marbles (64) by the total number of parts (8).
- 64 / 8 = 8

Step 3: Multiply the value of each part by the number of parts for the blue marbles.
- Multiply the value of each part (8) by the number of parts for the blue marbles (5).
- 8 * 5 = 40

Therefore, there are 40 blue marbles in the box.