Given:
Ratio of tulips to roses = 2:1
Total number of flowers = 18
To find:
The number of tulips.
Solution:
Let the number of tulips and roses are 2x and x respectively.
According to the question,
![2x+x=18](https://img.qammunity.org/2021/formulas/mathematics/high-school/bf4p31chgck48fs4qhqir545vzfzozr28x.png)
![3x=18](https://img.qammunity.org/2021/formulas/mathematics/middle-school/uped9xjlebijad3dxqfriw7ecc2h6qh4ia.png)
Divide both sides by 3.
![x=(18)/(3)](https://img.qammunity.org/2021/formulas/mathematics/high-school/qvvwyjfx6umtsma650bx90b70v2i5yfmv9.png)
![x=6](https://img.qammunity.org/2021/formulas/mathematics/high-school/nzo8scb8znl8ef5cz3hap4phamcv7nzmgh.png)
Now,
Number of tulips
![=2(6)](https://img.qammunity.org/2021/formulas/mathematics/high-school/mbd4t1ca7itovtktd7acefjd1z0o98uyd7.png)
![=12](https://img.qammunity.org/2021/formulas/mathematics/high-school/1lnzkpqw5g4nw5tq1gya8wo1ygeehgz21c.png)
Therefore, the number of tulips is 12.