4. of the 50 students in the cafeteria, 7 have red hair. if there are 750 students in the school, predict…
4. of the 50 students in the cafeteria, 7 have red hair. if there are 750 students in the school, predict the number of students who have red hair.
Answer
Explanation:
Step1: Set up proportion
Let $x$ be the number of students with red - hair in the school. The proportion is $\frac{7}{50}=\frac{x}{750}$.
Step2: Cross - multiply
$50x = 7\times750$.
Step3: Solve for $x$
$x=\frac{7\times750}{50}=105$.
Answer:
105