Of the first 150 participants, 36 chose the first picture in the set, and of the 150 remaining participants, p chose the first picture in the set. Hence, the proportion of the participants who chose the first picture in the set is
.Since more than 20% of all the participants chose the first picture, it follows that
>0.20 This inequality can be rewritten as
p+36>0.20(300). Since p is a number of people among the remaining 150 participants,
p≤150.
Choices A, B, and C are incorrect and may be the result of some incorrect interpretations of the given information or of computational errors.