Question

В цистерне 42 т бензина. Вначале откачали из нее 2 / 7 всего бензина, затем 40 % оставшегося в ней бензина, а затем 5 / 6 нового остатка. Сколько бензина осталось в цистерне? Помогите Плиззз ...Только уравнением!

Answer 1

42*2/7=12(л.)
(42-12)*0.4=12(л.)
(30-12)*5/6=15(л.)
42-(12+12+15)=3(л.)-осталось в цистерне
как решать такое уравнением не знаю

Answer 2

Problem Analysis

We are given a tank with 42 tons of gasoline. The following operations are performed on the tank: 1. 2/7 of the total gasoline is pumped out. 2. 40% of the remaining gasoline is pumped out. 3. 5/6 of the remaining gasoline is pumped out.

We need to find out how much gasoline is left in the tank after these operations.

Solution

Let's solve this problem step by step.

Step 1: Calculate the amount of gasoline pumped out in the first operation. - 2/7 of the total gasoline is pumped out. - To find the amount of gasoline pumped out, we multiply the total gasoline by 2/7. - Amount pumped out = (2/7) * 42 tons.

Step 2: Calculate the remaining gasoline after the first operation. - To find the remaining gasoline, we subtract the amount pumped out from the total gasoline. - Remaining gasoline = Total gasoline - Amount pumped out.

Step 3: Calculate the amount of gasoline pumped out in the second operation. - 40% of the remaining gasoline is pumped out. - To find the amount of gasoline pumped out, we multiply the remaining gasoline by 40%. - Amount pumped out = (40/100) * Remaining gasoline.

Step 4: Calculate the remaining gasoline after the second operation. - To find the remaining gasoline, we subtract the amount pumped out from the remaining gasoline. - Remaining gasoline = Remaining gasoline - Amount pumped out.

Step 5: Calculate the amount of gasoline pumped out in the third operation. - 5/6 of the remaining gasoline is pumped out. - To find the amount of gasoline pumped out, we multiply the remaining gasoline by 5/6. - Amount pumped out = (5/6) * Remaining gasoline.

Step 6: Calculate the final remaining gasoline after the third operation. - To find the final remaining gasoline, we subtract the amount pumped out from the remaining gasoline. - Final remaining gasoline = Remaining gasoline - Amount pumped out.

Let's calculate the values step by step:

Step 1: Calculate the amount of gasoline pumped out in the first operation. - Amount pumped out = (2/7) * 42 tons = 12 tons.

Step 2: Calculate the remaining gasoline after the first operation. - Remaining gasoline = 42 tons - 12 tons = 30 tons.

Step 3: Calculate the amount of gasoline pumped out in the second operation. - Amount pumped out = (40/100) * 30 tons = 12 tons.

Step 4: Calculate the remaining gasoline after the second operation. - Remaining gasoline = 30 tons - 12 tons = 18 tons.

Step 5: Calculate the amount of gasoline pumped out in the third operation. - Amount pumped out = (5/6) * 18 tons = 15 tons.

Step 6: Calculate the final remaining gasoline after the third operation. - Final remaining gasoline = 18 tons - 15 tons = 3 tons.

Answer

After performing the given operations, there will be 3 tons of gasoline left in the tank.

Please let me know if you need any further assistance!