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25% of the students in a school are in sixth grade.A. How many sixth graders are there if the school has160 students?B. How many sixth graders are there if the school has28 students?C. If the school has x students, write an expression for the number of sixth graders in terms of x. D. How many students are in the school is 42 of them are sixth graders.

Respuesta :

A.

Multiply the number of students (160) by the percentage that are in sixth grade (25%)

Express the percentage in decimal form = 25/100 = 0.25

160 x 0.25 = 40 students

B. Same process

28 x 0.25 = 7 students

C.

Multiply 0.25 by x

0.25x

D.

0.25x = 42

Solve for x

x =42/0.25

x= 168

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