Mrs. Herby bought some carrots. She put 2/5 of them on a platter and the rest in a plastic bag. If there were 8 carrots on the platter, how many carrots were there in the plastic bag?

2/5x = 8

Calculate x, then subtract 8.

To find the number of carrots in the plastic bag, we can use a proportion.

Let's represent the total number of carrots Mrs. Herby bought as "x."

According to the information given in the problem, Mrs. Herby put 2/5 of the carrots on a platter. So, the number of carrots on the platter is 2/5 * x.

Since we know the number of carrots on the platter is 8, we can set up the following proportion:

(2/5)x = 8

To solve for x, we can multiply both sides of the equation by the reciprocal of 2/5, which is 5/2:

(2/5)x * 5/2 = 8 * 5/2

Simplifying the equation gives us:

x = 20/2

x = 10

Therefore, Mrs. Herby bought a total of 10 carrots. Since she put 8 carrots on the platter, the remaining carrots are in the plastic bag.

To find the number of carrots in the plastic bag, we subtract the number of carrots on the platter from the total number of carrots:

Number of carrots in the plastic bag = Total number of carrots - Number of carrots on the platter

Number of carrots in the plastic bag = 10 - 8

Number of carrots in the plastic bag = 2

Therefore, there are 2 carrots in the plastic bag.