49 flowers total, minus the flower we already have:
49 - 1 = 48
48 is how many flowers we have to plant now,
and we know that 1 seed packet = 12 flowers...
We will divide the amount of flowers by the number of seeds in each packet:
48 / 12 = 4
So, you will need 4 seed packets to make a total of 49 flowers, including the preexisting flower!