Answer:
April = 19m³
Explanation:
18m³ × 6 months = 108m³ which is the total volume used in the six months.
16.2 + 18.1 + 15.9 + 17.8 + 21.0 = 89m³
April = 108m³ - 89m³
3.8m questions
4.8m answers