Twenty stamps cost $8.40. How much does it cost to buy 5 stamps?

Question

Question 3 options:

$42.00

$11.90

$4.20

$2.10

Answer 1

To find the cost of buying 5 stamps, we can set up a proportion:

20 stamps / $8.40 = 5 stamps / x

Cross multiplying, we get:

20x = 5 * $8.40

20x = $42

Dividing both sides by 20, we find:

x = $42 / 20

x = $2.10

Therefore, it costs $2.10 to buy 5 stamps.