James and 4 of his friends volunteered to plant flowers. In 2 days, they were able to plant a total of 200 flowers. If each of them planted the same number of flowers, how many flowers did James plant in a day?
Step-by-step reasoning:
20
There were 1 + 4 = 5 of them who volunteered to plant flowers.

Each day, the 5 of them planted a total of 200 / 2 = 100 flowers.

Thus, James planted 100 / 5 = 20 flowers in a day.

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Therefore, the answer is 20