Question

The green car has $1$ more fuel bottle than the number of fuel bottles in the yellow car. The yellow car has $7$ fuel bottles. Which of the following models correctly shows the total number of fuel bottles in both cars?

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

We can find the total number of fuel bottles in each car by adding the number of fuel bottles in the yellow car and the number of fuel bottles in the green car.

If option A is chosen,



Based on the given equation, $7+9=16$ means the number of fuel bottles in the yellow car is $7$, and the number of bottles in the green car is $9$. The total number of fuel bottles in both cars is $16$, but the calculation is incorrect because the number of fuel bottles in the green car should be $1$ more than $7$, therefore, Option A is incorrect.


If Option B is chosen,


Based on the given equation, $7+8=15$ means the number of fuel bottles in the yellow car is $7$, and the number of bottles in the green car is $8$. The green car has $1$ more bottle than the number of bottles in the yellow car. The total number of fuel bottles in both cars is $15$, but the calculation is incorrect because $8$ is broken into $4$ and $5$ which makes $9$, and $7$ and $4$ makes $11$. Therefore, Option B is incorrect.

If Option D is chosen,



Based on the given equation, $7+8=14$ means the number of fuel bottles in the yellow car is $7$, and the number of bottles in the green car is $8$. The green car has $1$ more bottle than the number of bottles in the yellow car. The total number of fuel bottles in both cars is $14$, but the calculation is incorrect because $7$ and $4$ make $11$. Therefore, Option D is incorrect.

If Option C is chosen,


Based on the given equation, $7+8=15$ means the number of fuel bottles in the yellow car is $7$, and the number of bottles in the green car is $8$. The total number of fuel bottles in both cars is $15$, the calculations are correct as $8$ is broken into $3$ and $5$, while $7$ and $3$ make $10$. And, finally $10$ and $5$ are added to get $15$ and the green car has $1$ more fuel bottle than the number of fuel bottles in the yellow car.

Therefore, there are $15$ bottles of fuel in both the cars.

Hence, Option C is correct.