Numbers and Quantities

If 20% of x = 80 then x= ?

• 400

• 40

• 4000

• 800

what is the ratio of red apples to green apples

• 7 to 3

• 4 to 7

• 4 to 3

• 3 to 4

convert 2/4 into percent

• 50

• 100

• 500

• 200

convert 0.85 into percentage

• 850%

• 85%

• 8500%

• none

• 0.012

• 0.12

• 1.2

• 12

The diameter of a speck of dust is about 0.00002 inches. Which of these is an appropriate estimate for the diameter of the speck of dust?

• 2 × 10^–5 in.

• 2 × 10^–4 in.

• 2 × 10⁵ in.

Which of the following would be a reasonable estimate for the weight of a pencil?

• 1x10^-20 lb

• 1x10² lb

• 1x10²⁰ lb

• 1x10^-2 lb

• 340000

• 340

• 3400

• 34000

What can (2.5 x 10^8) be estimated as for easier comparison in scientific notation?

• (2 x 10^8)

• (3 x 10^8)

• (2.5 x 10^7)

• (3 x 10^9)

find the ratio of 40 paise to ₹4

• 1 : 10

• 10 : 1

• 100: 1

• 1 : 100