If 2 bowls of herbs cost 4 tokens, how many tokens are required to purchase half a bowl of herb?
As per the question
2 bowls of herbs cost 4 tokens.
Hence, 1 bowl of herb costs 2 tokens.
∴ Half a bowl of herb costs half of 2 tokens, which is equal to 1 token.
Therefore, half a bowl of the herb can be purchased with 1 token.