Math help needed: how many investors use only discount brokers?

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In a poll conducted among 180  active investors, it was found that 100 use discount brokers, 122 use full-service brokers, and 54 use both discount and full-service brokers. How many investors use only discount brokers?

Nov 15th, 2015

Thank you for the opportunity to help you with your question!

I realy see a problem here 

If :

100 use  discount brokers

122 use ful service 

and 54 use both, so

100-54 = 46 and answer is C

but then only full service brokers use

122-54= 68 

and 68+46+54=168. I can't get, where 12 more people are lost from 180

Please let me know if you need any clarification. I'm always happy to answer your questions. If you like my answer, please, rate me =)
Nov 15th, 2015

are you sure, that the task is correct?

Nov 15th, 2015

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