Remember them is the best way to go.
draw the exact value triangles if you're unsure, but importantly, you just need to memorise these exact values.
Answer:
the answer for y is 9 and x is 9✔2( the check is square root symbol)
If you choose Vanilla, there are 22 choices of toppings.
If you choose Chocolate, there are 22 choices of toppings.
If you choose Strawberry, there are 22 choices of toppings.
22+22+22 = 66
Therefore, there are 66 choices of toppings.
I’m not 100% sure, but I believe it’s A and C