Kim ate 3⁄10 of a bag of potato chips; sandy ate 3⁄7 of a bag; and jeff ate 3⁄9 of a bag. who ate the most, kim, jeff, or sandy?

The most is Sandy

Step-by-step explanation:

we know that

When we compare fractions of the same numerator and different denominator, the fraction with the lowest denominator is greater

so

In this problem we have

Kim ate of a bag

Sandy ate of a bag

Jeff ate of a bag

the lowest denominator is  

therefore

The most is Sandy

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

the correct answer is 5 6 and 7