PLEASE HELP An 18 ounce jar contains 510 grams of grape jelly. How many kilograms of grape jelly does the jar contain?

1 kg = 1000 grams

A) 5.1 kg

B) 0.52 kg

C) 0.51 kg

D) 51 kg

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George has seven boxes of five pencils. giulio three boxes of eight pencils. one of the boys arranges all his pencils equally into two groups. was this george or giulio how many are in each group explain