Twenty stamps cost $8.40. How much does it cost to buy 5 stamps?
Question 3 options:
$42.00
$11.90
$4.20
$2.10
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.