The Venn diagram below choices of subject by 40 student.18 chose chemistry ,20 chose physics and 15 chose biology ,2 chose chemistry only,8 chose physics only and 1 chose biology only, 4 chose all students. find the number of students who chose none of the three students.​

i think there was a typo. you wrote pat brings 3 quarts of ice-cream to the party. each serving of ice-cream is 1 6 quart. how many total servings of ice-cream does pat bring to the party? i think the bold is supposed to be 1/6. so 1 quart of ice cream = 6 servings. 6 * 3 = 18.

what level of math? also i don't need to be paid if i can you.