Answer:
<u>10 sundaes</u> will be vanilla.
Step-by-step explanation:
Given:
Fernando is making 30 sundaes with mint, chocolate,and vanilla ice cream.
1/3 of the Sunday's are mint ice-cream.
And 1/2 of the remaining sundaes are chocolate.
The rest are vanilla.
Now, to find the number of sundaes that will be vanilla.
Fernando is making sundaes total = 30.
So, the quantity of sundaes that are mint ice-cream:

<em>Thus, 10 sundaes are mint ice-cream.</em>
So, the remaining sundaes are:

<em>Thus, the remaining sundaes are = 20.</em>
Now, to get the quantity of chocolate sundaes of the remaining sundaes:

<em>Hence, 10 sundaes are chocolate of the remaining 20 sundaes.</em>
<em>As, given the rest are vanilla.</em>
Now, to get the vanilla sundaes we subtract the 10 chocolate ice-cream from the 20 remaining sundaes:

Therefore, 10 sundaes will be vanilla.