Question

В цистерне было 20 т.топлива.Каждое утро из нее выливабт 5т топлива,а доливают 3т топлива.На сколько суток хватит топлива в цистерне?Через сколько суток в цистерне останется 8 т.топлива?

Answer 1

1) (20-5)+3=15+3=18(л) топлива в 1 день                                                           2) (18-5)+3=13+3=16(л) топлива во 2 день                                                          3) (16-5)+3=11+3=14(л) топлива в 3 день                                                           4) (14-5)+3=9+3=12(л) топлива в 4 день                                                             5) (12-5)+3=7+3=10(л) топлива в 5 день                                                              6) (10-5)+3=5+3=8 (л) топлива в 6 день                                                                    Ответ: Через 6 суток, в цистерне останется 8(л) бензина 

Answer 2

To calculate how many days the fuel in the tank will last and how many days it will take for the fuel in the tank to reach 8 tons, we need to consider the daily fuel consumption and refueling.

Calculation for how many days the fuel will last:

- The tank initially contains 20 tons of fuel. - Each morning, 5 tons of fuel are poured out of the tank. - Additionally, 3 tons of fuel are added to the tank each day.

To determine how many days the fuel will last, we can calculate the net change in fuel each day. The net change is the difference between the fuel poured out and the fuel added.

- Net change in fuel each day: 5 tons (poured out) - 3 tons (added) = 2 tons

Since 2 tons of fuel are consumed each day, we can divide the initial fuel amount of 20 tons by the net change of 2 tons to find the number of days the fuel will last:

20 tons / 2 tons per day = 10 days

Therefore, the fuel in the tank will last for 10 days.

Calculation for how many days until 8 tons of fuel remain:

To determine how many days it will take for the fuel in the tank to reach 8 tons, we can calculate the net change in fuel each day until the remaining fuel reaches 8 tons.

- Net change in fuel each day: 5 tons (poured out) - 3 tons (added) = 2 tons

We can subtract the net change of 2 tons each day from the initial fuel amount of 20 tons until we reach 8 tons:

20 tons - 2 tons = 18 tons (after 1 day) 18 tons - 2 tons = 16 tons (after 2 days) 16 tons - 2 tons = 14 tons (after 3 days) ... 10 tons - 2 tons = 8 tons (after 6 days)

Therefore, it will take 6 days for the fuel in the tank to reach 8 tons.

Please note that these calculations assume a constant daily consumption and refueling rate.