Answer:
143.2 L
Explanation:
1 pm: 1870 L
Each hour, 14% is drained.
x - 14% of x = x - 0.14x = 0.86x
To decrease a number by 14%, multiply the number by 0.86
2 pm: 0.86 × 1870 L = 1608.2 L
3 pm: 0.86 × 1608.2 L = 1383.052 L
4 pm: 0.86 × 1383.052 L = 1189.4247 L
5 pm: 0.86 × 1189.4247 L = 1022.9052 L
6 pm: 0.86 × 1022.9052 L = 879.69847 L
From 5 pm to 6 pm, the volume decreased from 1022.9052 L to 879.69847 L:
1022.9052 L - 879.69847 L = 143.2068 L
Answer: 143.2 L