Final answer:
Josh bought a total of 1800 grams of fruit.
Step-by-step explanation:
To find the total weight of fruit Josh bought, we need to convert all the measurements to the same unit. We know that 1 kilogram is equal to 1000 grams, and 1 centigram is equal to 0.01 grams. So, 1.5 kilograms of oranges is equal to 1500 grams, 150 grams of grapes is equal to 150 grams, and 15,000 centigrams of apples is equal to 150 grams. Adding these numbers together, Josh bought a total of 1500 + 150 + 150 = 1800 grams of fruit.