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If a car travels 300 km in 3 hours, what is the ratio of kilometers to hours? 100:1

3:300

300:3

1:100

A bag contains black and white marbles in the ratio of 2:3. If there are 10 black marbles, how many white marbles are there? 15 white marbles

20 white marbles

10 white marbles

5 white marbles

In a class, the ratio of students wearing glasses to those not wearing glasses is 1:4. If there are 20 students in the class, how many are wearing glasses? 4 students

5 students

15 students

10 students

A rectangle has a length of 10 cm and a width of 5 cm. What is the ratio of the width to the area of the rectangle? 1:10

1:20

1:50

1:2

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