Marta bought a 0.25 kilogram box of fish food. she uses 80 grams a week. is one box of fish food enough for 4 weeks? explain.

She bought 0.25 KG which is 250 gram , if she uses 80 a week then in a 4 weeks period she would use 80x4=320 gram .
so the 250 gram will not be enough

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The answer should be b.