A community of 45 houses each uses 100 litres of water per day. If a water‑saving campaign reduces usage by 15% per house, how many litres will the community use in one day after the campaign?

Step-by-step solution

1. Total water before campaign = 45 × 100 = 4500 litres.
2. 15% reduction means 85% of usage remains.
3. Remaining water = 4500 × 0.85 = 3825 litres.

Concept tested: Water usage calculation

Published 10 October 2026 · How this solution was prepared and checked