Multiple choice general knowledge math & puzzles

At the McDuffy Middle School, there are 80 students in Grade 7. Of these students, 34% have brown hair and 61% have black hair. The rest of the students have red hair. How many students have red hair?

  1. 2

  2. 4

  3. 5

  4. 6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The percentage of students with red hair is 100% - (34% + 61%) = 5%. To find the number of students, calculate 5% of 80: 0.05 * 80 = 4. Therefore, 4 students have red hair.

AI explanation

To solve this question, we need to find the percentage of students that have red hair.

Given that 34% of the students have brown hair, 61% have black hair, and the remaining students have red hair, we can calculate the percentage of students with red hair by subtracting the percentages of students with brown and black hair from 100%.

Percentage of students with red hair = 100% - (34% + 61%) = 5%

Now, we can calculate the number of students with red hair by multiplying the percentage of students with red hair by the total number of students:

Number of students with red hair = 5% of 80 students = (5/100) * 80 = 4 students

Therefore, the correct answer is B) 4.

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