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Genevieve bought 5/6kg of chestnuts. She roasted 3/10 of them. how many kg of chestnuts was not roasted?

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2 Answers

The total quantity of chestnuts is (5/6)kg. If she roasted (3/10) of them, then that implies she did not roast (7/10)

If the amount roasted is 3/10 of 5/6 kg, that means (3/10)*(5/6) = 15/60 = 1/4 kg. 

Therefore, the amount not roasted is (7/10)*(5/6) = 35/60 = 7/12 kg. 

Note that the amount roasted + not roasted should sum to the original amount:
15/60 + 35/60 = 50/60 = 5/6 kg.

Amount purchased = 5/6 kg or 0.8333kg

Fraction of the total amount (0.8333kg) roasted = 3/10 or 0.3 kg

Therefore, amount roasted = 0.8333 * 0.3

                                        = 0.25 kg.

To determine the amount not roasted = (total amount purchased - amount roasted)

                                                       = 0.8333 - 0.25

                                                       = 0.5833 kg.