QS1. A lake had 20000 gallons of water before the summer season. The summer season reduced the water quantity by 15%. Determine the new quantity of water.

Ops: A. 12000 gallons

B. 17000 gallons

C18000 gallons

D. 16000 gallons

To determine the new quantity of water after a 15% reduction, follow these steps:

1. **Original Quantity of Water**: 20,000 gallons
2. **Percentage Reduction**: 15%

To calculate the reduction amount:

\[
\text{Reduction Amount} = \frac{15}{100} \times 20000 = 0.15 \times 20000 = 3000 \text{ gallons}
\]

Now, subtract the reduction amount from the original quantity:

\[
\text{New Quantity of Water} = 20000 - 3000 = 17000 \text{ gallons}
\]

The correct option is **B. 17000 gallons**.

Would you like more details or have any further questions? Here are five related questions:

1. If the lake lost 25% of its water instead of 15%, what would the new quantity of water be?
2. How much water would be left if the reduction was 50%?
3. What would be the percentage reduction if only 15,000 gallons were left?
4. How many gallons would be left if the reduction was 10%?
5. If the lake was refilled back to its original 20,000 gallons, by what percentage did it increase?

**Tip:** When working with percentages, multiplying the original value by the percentage in decimal form helps to calculate changes easily.

Learn how to calculate the new quantity of water after a 15% reduction from an original quantity of 20,000 gallons. This problem involves percentage calculations and arithmetic operations. Suitable for students in Grades 6-8.

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