Question

25% of seventh graders wear glasses. If 100 students wear glasses, how many seventh graders are there in total?

a) 25
b) 75
c) 400
d) 500

Answer 1

To find the total number of seventh graders, divide the number of students wearing glasses (100) by the given percentage (25%) represented as a decimal (0.25), which gives us 400 seventh graders in total.

Step-by-step explanation:

To determine the total number of seventh graders based on the given percentage, we can use the following ratio expression: 25% of the total number of seventh graders equals 100 students who wear glasses. This relationship can be represented mathematically as:

0.25 × Total number of seventh graders = 100

To find the total number, we divide 100 by 0.25, which can be mathematically expressed as:

Total number of seventh graders = 100 ÷ 0.25

When we calculate this, we get:

Total number of seventh graders = 400

Therefore, the correct answer is (c)400.