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How is 1 wrong? 1×3=3; 3-1-1-1=0
Make a equation
Let say, at first you had x flowers, triple it and subtract y, then repeat this… Eventually you will find a simple equation with two variables, then find the crux move. Find the minimum number so that the equation is true. It is asked to find the min(x).
Basically you have to swim each time before placing flowers in each temple leaving no flower unplaced. That gives us
3(3(3x-y) -y) -y = 27x - 13y = 0