I need help on this I cant figure it out..

Answer:
15
Step-by-step explanation:
We have been told:
Therefore, to find the number of throws Quinn made, we need to find 1/6 of 18, then subtract this from 18 (the number of throws Alex made).
[tex]\begin{aligned}\sf \dfrac16\:of\:18 &=\sf \dfrac16 \times 18\\\\ & = \sf \dfrac{1 \times 18}{6}\\\\ & = \sf\dfrac{18}{6}\\\\ & =\sf18 \div 6\\\\ & =\sf3\end{aligned}[/tex]
Now we have calculated 1/6 of 18, we can subtract it from 18 to find the number of throws Quinn made:
⇒ Number of throws Quinn made = 18 - 3 = 15