Answer:
70 flowers
Explanation:
To find the total number of flowers in the vase, given that 30% of them are carnations and there are 21 carnations in the vase, we can use the following equation:
Let "x" be the total number of flowers in the vase.
30% of x = 21
0.30 × x = 21
0.30x = 21
We can now solve for x by dividing both sides of the equation by 30% (or 0.30 as a decimal):

x = 70
So, there are 70 flowers in the vase.