Need help with math

In a survey of 250 households regarding the ownership of desktop and laptop computers, the following information was obtained: ​
130 households own only desktop computers. 30 households own only laptop computers.
50 households own neither desktop nor laptop computers. ​

How many households own both desktop and laptop computers?

Please help. thank you ​

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asked by Kal Jay
  1. people who own both (b) will be counted in both groups (laptop owners and desktop owners)

    when you count all of the households, the "both" group is only counted once

    130 + 30 + 50 + b = 250

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    posted by Scott
  2. Scott is correct :3

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    posted by Lollipops

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