The table shows the readings of hot and cold water meters on the first day of each month. The cost of water supply is: hot - 140 rubles/m³, cold - 30 rubles/m³. Determine in which months the cost of water supply exceeded 690 rubles.

Calculation of water supply costs:

• January: Hot water cost: 16.5 m³ * 140 rub/m³ = 2310 rub. Cold water cost: 11.5 m³ * 30 rub/m³ = 345 rub. Total: 2310 + 345 = 2655 rub.
• February: Hot water cost: 20.1 m³ * 140 rub/m³ = 2814 rub. Cold water cost: 17.2 m³ * 30 rub/m³ = 516 rub. Total: 2814 + 516 = 3330 rub.
• March: Hot water cost: 25 m³ * 140 rub/m³ = 3500 rub. Cold water cost: 23.1 m³ * 30 rub/m³ = 693 rub. Total: 3500 + 693 = 4193 rub.
• April: Hot water cost: 28.2 m³ * 140 rub/m³ = 3948 rub. Cold water cost: 29.6 m³ * 30 rub/m³ = 888 rub. Total: 3948 + 888 = 4836 rub.
• May: Hot water cost: 32.5 m³ * 140 rub/m³ = 4550 rub. Cold water cost: 36.5 m³ * 30 rub/m³ = 1095 rub. Total: 4550 + 1095 = 5645 rub.

Answer: In all the listed months (January, February, March, April, May), the cost of water supply exceeded 690 rubles.