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
Differentiate both sides wrt
:

By the chain rule, we get


Solve for
:


The answer is 16 yellow flowers
28 people going.....3 vans and 1 car....8 people per van
if there is 8 people per van, and there is 3 vans....8 * 3 = 24 people take the vans......leaving 28 - 24 = 4 people taking the car <==