Even adults fail to find the answer to this children's math puzzle

There are math questions that are not as simple as they seem at first glance.
Here is one for you.
Give your brain a good workout and see if you can answer this question:
How much is the result of the last equation?
Take several minutes to yourself and see if you can solve it..
Any success? ..
Ready to see the answer? Go on..
The answer to the flower puzzle
The correct answer is actually 81. You probably did not get to it because of two small details you missed.
First of all, the number of yellow flowers: in the third equation there are two, and in the last equation there is only 1.
But the second nuance is more complicated: the number of petals that the purple flowers have. Did you not notice those? Well, if not  we forgive you!
In the second equation, these flowers are equal to 5  they have 5 petals each, they are all equal to 1.
In the last question, the purple flower have 4 petals (4X1). So 20X4 + 1 = 81.
If you succeeded  well done! You did pay attention to the little details.
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