Question

samir and jillian share a phone plan. each month they can use a combined total of up to 8 gb of data. so far this month, samir has used 4.23 gb and jillian has used 2.89 gb. they want to know whether they still have data left to use.

you found that samir and jillian have used about 7 gb of data.

do samir and jillian have any data left to use?

samir and jillian have used less than 8 gb of data,
so they do have data left to use.

samir and jillian each tried to calculate the exact amount of total data they have used. use your approximation to choose who you think is correct.
samir: 6.12 gb jillian: 7.12 gb

Explanation:

Step1: Calculate exact used data

$4.23 + 2.89 = 7.12$ GB

Step2: Compare to plan limit

$7.12 < 8$

Step3: Match to approximation

Our approximation was ~7 GB, which is close to 7.12 GB.

Answer:

1. Do Samir and Jillian have any data left to use?

Samir and Jillian have used less than 8 GB of data, so they do have data left to use.

1. Who calculated the exact used data correctly?

Jillian: 7.12 GB