Math Mania Class 8

In a room, there are 8 boys to 12 girls. What is the ratio of girls to boys?

• 8 : 20

• 12 to 20

• 3 to 2

• 4/6

If x and y are directly proportional, then which of the following is correct?

• x + y = constant

• xy = constant

• x – y = constant

• x/y = constant

If the weight of 12 sheets of thick paper is 40 grams, how many sheets of the same paper would weigh 2500 grams?

• 750

• 800

• 850

• 950

The scale of a map is given as 1:300. Two cities are 4 km apart on the map. The actual distance between them is:

• 1000 km

• 1100 km

• 1200 km

• 1300 km

Express a speed of 36 kmph in meters per second?

• 10 mps

• 60 mps

• 78 mps

• 11 mps

Nine more than a number

Three times a number is twenty-one.

Which equation has x =2 as a solution?

• 3 + x = 10

• 11 + x = 13

• 4x = 32

• 5x =25