A stagnant water body of 150 litres is found in a village. Mosquitoes lay 15,000 eggs in it. If each larva consumes 2 millilitres of water before pupation, how much water remains after all larvae have emerged?

Step-by-step solution

1. Convert 2 millilitres to litres: 2 ml = 0.002 litre.
2. Water consumed by all larvae = 15,000 × 0.002 = 30 litres.
3. Subtract from initial water: 150 – 30 = 120 litres.
4. Hence 120 litres remain.

Concept tested: Mosquito larva water consumption

Published 1 October 2026 · How this solution was prepared and checked