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 2.80 gb. they want to know whether they still have data left to use. find the sum of samir’s and jillian’s data. compare that amount to 8 gb. an exact calculation is not necessary to solve the problem. you can approximate the sum by rounding the addends. round each person’s data to the nearest gigabyte. samir: gb jillian: ? gb

Explanation:

Step1: Round Samir's data to nearest GB

Samir's usage: $4.23$ GB. Since $0.23 < 0.5$, round down to $4$ GB.

Step2: Round Jillian's data to nearest GB

Jillian's usage: $2.80$ GB. Since $0.80 > 0.5$, round up to $3$ GB.

Step3: Calculate total approximate usage

$\text{Total} = 4 + 3 = 7$ GB

Step4: Compare to 8 GB limit

$7 < 8$, so data remains.

Answer:

Samir: 4 GB
Jillian: 3 GB
Yes, they still have data left to use.