Question

На стоянке стояло 15 грузовых машин и 15 легковых. Когда несколько машин уехало, то осталось на стоянке 24 машины. Сколько машин уехало со стоянки?Решить двумя способами.

Answer 1

Способ первый:
1) 15+15=30 - это сколько всего машин на стоянке
2) 30 - 24 = 6  - это сколько машин уехало
или
(15+15) -24 = 6
Способ второй:
пусть х - это кол-во машин, которые уехали, тогда
х+24=15+15
х= 30 - 24
х= 6
Ответ: 6

Answer 2

Problem Statement

На стоянке стояло 15 грузовых машин и 15 легковых. Когда несколько машин уехало, то осталось на стоянке 24 машины. Сколько машин уехало со стоянки? Решить двумя способами.

Solution 1: Algebraic Approach

Let's assume that the number of trucks that left the parking lot is represented by 'x'. Since there were initially 15 trucks and 15 cars, the total number of vehicles on the parking lot was 15 + 15 = 30.

After some vehicles left, there were 24 vehicles left on the parking lot. We can set up the following equation to represent this situation:

15 (initial number of trucks) + 15 (initial number of cars) - x (number of trucks that left) = 24 (number of vehicles left)

Simplifying the equation, we get:

30 - x = 24

To find the value of 'x', we can subtract 24 from both sides of the equation:

30 - x - 24 = 24 - 24 6 - x = 0

Finally, we can solve for 'x' by subtracting 6 from both sides of the equation:

6 - x - 6 = 0 - 6 -x = -6

To isolate 'x', we multiply both sides of the equation by -1:

-x * (-1) = -6 * (-1) x = 6

Therefore, 6 trucks left the parking lot.

Solution 2: Subtraction Approach

Another way to solve this problem is by using subtraction. We know that there were initially 15 trucks and 15 cars on the parking lot, making a total of 30 vehicles.

When some vehicles left, there were 24 vehicles left on the parking lot. To find the number of vehicles that left, we can subtract the number of vehicles left from the total number of vehicles:

30 (total number of vehicles) - 24 (number of vehicles left) = 6 (number of vehicles that left)

Therefore, 6 vehicles, which were trucks in this case, left the parking lot.

Conclusion

In conclusion, 6 trucks left the parking lot. We arrived at this answer using two different approaches: an algebraic approach and a subtraction approach. Both methods yield the same result.