Razão e Proporção

Identify the ratio of boys to girls in a class of 30 students if there are 18 boys.

• 3:2

• 5:4

• 4:5

• 2:3

Solve for x: 3/5 = x/15

• 9

• 7

• 12

• 5

Explain the concept of equivalent ratios with an example.

• Equivalent ratios are when the numerators are the same but the denominators are different.

• Equivalent ratios are when the ratios are in descending order.

• For example, the ratios 2:3 and 4:6 are equivalent because when you multiply the first ratio by 2, you get the second ratio (2*2=4 and 3*2=6).

• Equivalent ratios are when the sum of the numerators is equal to the sum of the denominators.

If a recipe calls for 2 cups of flour for every 3 cups of sugar, how many cups of flour are needed for 9 cups of sugar?

• 10

• 6

• 8

• 4

Interpret the ratio 4:7 as a fraction in simplest form.

• 7/4

• 4/7

• 4:7

• 0.57

A car travels 240 miles on 12 gallons of gas. How many miles can it travel on 20 gallons of gas?

• 200 miles

• 400 miles

• 360 miles

• 320 miles

In a bag of marbles, the ratio of red marbles to blue marbles is 2:5. If there are 35 blue marbles, how many red marbles are there?

• 25

• 10

• 20

• 15

If 5 workers can build a wall in 10 days, how many workers are needed to build the same wall in 5 days?

• 10

• 12

• 8

• 15

Explain how to solve a word problem involving ratios step by step.

• Use a magic wand to solve the word problem involving ratios

• Ask a friend to solve the word problem involving ratios for you

• Follow the steps provided in the explanation to solve the word problem involving ratios.

• Guess the answer to the word problem involving ratios

A map scale is 1:25000. If two cities are 5 cm apart on the map, how far are they from each other in reality?

• 1.25 kilometers

• 4.5 kilometers

• 3.75 kilometers

• 2.5 kilometers