Question

Carlos bought 80 feet of rope for $17.60. He needs 20 more feet. If the unit price is the same how much will he pay for the extra 20 feet of rope? Show each step of your solution and explain your reasoning.

Answer 1

Answer:

$4.40

Step-by-step explanation:

ok so this is an instance of proportional relationships, in this case we changed one side of this equation, and now we need to figure out how to change the other side the that the change is made on both sides of the (=)

heres what we know

$17.60 = 80ft.

$??.?? = 20ft.

to help us find the change we can divide the first known side with second known side as shown below

80 / 20 = 4

so now we know that 80 was divided by 4 to get 20, so now we can divide the other side by the same amount to get...

$17.60 / 4 = $4.40

so it costs $4.40 for 20 ft. of rope

EXTRA: just because we can, lets figure out what 1 ft of rope costs using the same method as show above (starting with 20 ft)

20 / 1 = 20

$4.40 / 20 = $0.22

so the rate at wich the rope is sold is 22 cents a foot

Answer 2

It’s $4.40 hopefully this helps