Question

На крыше дома сидели голуби. Когда на крышу сели ещё 15 голубей ,а с нее улетели 18 голубей, то на крыше стало 16 голубей. сколько голубей сидело на крыше первоначально?

Answer 1

Именно это и написано ранее в комментарии))

Answer 2

16+18-15  19 голубей может 

Answer 3

Problem Analysis

We are given the following information: - Initially, there were some pigeons sitting on the roof of a house. - When 15 more pigeons landed on the roof, the total number of pigeons became 16. - After that, 18 pigeons flew away from the roof.

We need to determine the initial number of pigeons sitting on the roof.

Solution

Let's assume the initial number of pigeons sitting on the roof is x.

According to the given information: - When 15 more pigeons landed on the roof, the total number of pigeons became 16. This can be represented as: x + 15 = 16. - After that, 18 pigeons flew away from the roof. This can be represented as: (x + 15) - 18 = 0.

To find the initial number of pigeons, we can solve these equations.

Mathematical Solution

Let's solve the equations to find the value of x.

Equation 1: x + 15 = 16 - Subtract 15 from both sides: x = 16 - 15 - Simplify: x = 1

Equation 2: (x + 15) - 18 = 0 - Substitute the value of x from Equation 1: (1 + 15) - 18 = 0 - Simplify: 16 - 18 = 0 - Simplify further: -2 = 0

Since the equation -2 = 0 is not true, it means there is no solution for this system of equations. This implies that the given information is inconsistent or contradictory.

Conclusion

Based on the given information, it is not possible to determine the initial number of pigeons sitting on the roof. The information provided leads to contradictory equations, indicating an inconsistency in the problem statement.