To calculate the weight of oranges Pete should use, we can set up the equation based on the fact that 30% of the weight of the oranges becomes juice. Let the weight of the oranges be $x$ grams. Since 30% of $x$ will give Pete the amount of juice he needs (150 g), we can write the equation:

$0.30 \times x = 150$

To find $x$, divide both sides by 0.30:

$x = \frac{150}{0.30} = 500 \, \text{grams}$

So, Pete should use 500 grams of oranges to produce 150 grams of juice.

Would you like more details or have any further questions?

Here are 5 related questions:

1. How much juice would Pete get from 1 kg of oranges?
2. If Pete only has 400 g of oranges, how much juice can he expect to make?
3. What percentage of the fruit is waste if only 30% becomes juice?
4. If Pete needs 300 g of juice, how many kilograms of oranges are required?
5. How would the amount of juice change if the juice yield was 35% instead of 30%?

Tip: For percentage-based calculations, multiplying the total quantity by the percentage in decimal form simplifies the process!