Question

There were 312 people at a carnival. Vanilla and chocolate ice cream was offered. 1/8 of the people at the carnival did not eat ice cream. 2/3 of the people that ate ice cream chose chocolate.

How many people chose vanilla?​

Answer 1

91

Explanation:

7/8 of the people ate ice cream, and 1/3 of those chose vanilla, so the number choosing vanilla is ...

(7/8)(1/3)(312) = 91

91 people chose vanilla.

_____

If the choices are A or B, and some fraction f chose A, then the fraction choosing B is (1-f). 1 -1/8 = 7/8; 1 -2/3 = 1/3.