(1) A wheat contains 65438+7 parts of carbohydrates, protein 1 part, and the rest. Other substances in this wheat account for 5 1, and the existing wheat 100kg can extract protein (10)kg.

1- 1/ 10-7/ 10=2/ 10= 1/5

100 *110 =10 kg

(2) A bag of 30 kilograms of rice was eaten for four fifths on the first day, and there were (29.2) kilograms left. I ate four fifths of this bag of rice in January, and there are (6) kilograms left.

30-4/5=30-0.8=29.2 kg

30*( 1-4/5)=6 kg