Answer :

olumideolawoyin

Answer:

10kg

Step-by-step explanation:

If Douglas sold 2/3 of 30kg yam = 2/3 × 30 = 2 × 10 = 20kg.

The mass of the unsold yam = 30 - 20 = 10kg

Heather

Answer: 10 kg of the yam not sold

Step-by-step explanation:

     We will find out how many kg of the yam was not sold.

     If he sold exactly 2/3 of the yam, then 3/3 - 2/3 = 1/3 of the yam is left. In mathematics, "of" means multiplication.

        30 kg * 1/3 = 10 kg of the yam not sold

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