After reading 80% of her emails in her inbox, Danette still has M unread emails.
2 answers:
Answer:
and
Step-by-step explanation:
1. Let's imagine that you have 100 e-mails unread. When you read 80% of these e-mails you have the following amount unread:
e-mails
2. If you substitute 20 e-mails into the equations shown above, you will obtain the original amount:
answer : option A and B
After reading 80% of her emails in her inbox, Danette still has M unread emails
M unread emails
Let x be the number of emails before reading
80% of emails are left in the box. So, 0.08x emails are left in the box
Now we make an equation
number of emails - 80% of unread emails= number of unread mails
x - 0.08x = M
Now we factor out x
x ( 1- 0.08) = M
So
or
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