There was a total of $640$ students at school on Friday. Every student either walked or rode in a bus to the school. If $45\%$ of the total number of students walked to school on Friday, how many students rode in a bus to the school?

Full solution

Q. There was a total of

640

students at school on Friday. Every student either walked or rode in a bus to the school. If

45\%

of the total number of students walked to school on Friday, how many students rode in a bus to the school?

Identify Students and Percentage: Identify the total number of students and the percentage that walked to school. The total number of students is $640$ , and $45\%$ of them walked to school.
Calculate Students Who Walked: Calculate the number of students who walked to school. $\newline$ To find out how many students walked, multiply the total number of students by the percentage that walked, expressed as a decimal. $\newline$ Number of students who walked = $45\%$ of $640$ = $0.45 \times 640$
Find Number of Students Who Walked: Perform the calculation to find the number of students who walked. $\newline$ $0.45 \times 640 = 288$ $\newline$ So, $288$ students walked to school.
Calculate Students Who Rode Bus: Subtract the number of students who walked from the total number of students to find the number of students who rode in a bus. $\newline$ Number of students who rode in a bus $=$ Total number of students $-$ Number of students who walked $\newline$ Number of students who rode in a bus $= 640 - 288$
Find Number of Students Who Rode Bus: Perform the subtraction to find the number of students who rode in a bus. $\newline$ $640 - 288 = 352$ $\newline$ So, $352$ students rode in a bus to school.