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The mass ratio of flour, fresh meat and vegetables is 4:2: 1.

Then the fresh meat is 15 kg, and the number of copies is 2.

Explain that one is

15÷ 2 = 7.5kg.

Then the flour needed should be 4×7.5=30 kg.

The increase is 30- 15= 15 kg.

The rest of the vegetables are

15-7.5=7.5 kg

① Add 15kg flour.

② There are 7.5 kilograms of vegetables left.