Keystone Middle School has twelve sixth-grade classes. Three of the classes have both advanced math and advanced science. What percent of the sixth-grade classes have both advanced math and science?

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step-by-step explanation:

c.35

step-by-step explanation:

8+13=21

21+8=29

29+6=35

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56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6