a group of childern were on a bus. three childern got off the bus at the first stop. at the next stop, 12 kids got on the bus. there are now twice as many kids on the bus as there were at the start. how many kids are on the bus?

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Denote number of children: Let's denote the number of children on the bus at the start as x. According to the problem, three children got off the bus at the first stop. So, the number of children on the bus after the first stop is x - 3.First stop: Three children off: At the next stop, 12 kids got on the bus. So, the number of children on the bus after the second stop is (x - 3) + 12.Second stop: Twelve kids on: The problem states that there are now twice as many kids on the bus as there were at the start. This means that after the second stop, the number of children on the bus is 2x. So, we can set up the equation (x - 3) + 12 = 2x.Equation setup and simplification: Now, let's solve the equation for x. First, we simplify the left side of the equation: x - 3 + 12 = x + 9. So, the equation now is x + 9 = 2x.Solve for x: To find the value of x, we subtract x from both sides of the equation: x + 9 - x = 2x - x, which simplifies to 9 = x.Final number of kids: Now that we have the value of x, which is 9, we can find out how many kids are on the bus after the stops. Since there are twice as many kids on the bus as there were at the start, we multiply x by 2: 2 * 9 = 18.

A group of children were on a bus. Three children got off the bus at the first stop. At the next stop, $12$ kids got on the bus. There are now twice as many kids on the bus as there were at the start. How many kids are on the bus?

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A group of children were on a bus. Three children got off the bus at the first stop. At the next stop, 121212 kids got on the bus. There are now twice as many kids on the bus as there were at the start. How many kids are on the bus?

A group of children were on a bus. Three children got off the bus at the first stop. At the next stop, $12$ kids got on the bus. There are now twice as many kids on the bus as there were at the start. How many kids are on the bus?