First you need to find the total mass of the prepared syrup.
To do this, add the mass of water to the weight of sugar.
150 + 650 = 800 grams.
In order to determine the percentage of sugar in the prepared syrup, the weight of the sugar must be divided by the total weight of the syrup and multiplied by 100%.
Thus, we get:
150/800 * 100% = 0.1875 * 100% = 18.75%.
Answer: The syrup contains 18.75% sugar.
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