Let the total seed packets needed Anthony to have 90 plants be x.
then,
64:32 :: 90:x
2:1 :: 90:x
90 = 2x
x = 45 seed packets.
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64 plants = 32 seed packets.
1 plant = [tex] \frac{32}{64} = \frac{1}{2} [/tex] seed packets.
90 plants = [tex] \frac{1}{2} \times 90 = 45[/tex] seed packets.
Anthony need 45 seed packets to have 90 plants.
!! Hope It Helps !!
