Question

After reading 80\%80%80, percent of her e-mails in her inbox, Danette still has MMM unread e-mails.

Answer 1

Answer:

The required expression is $x= \frac{M}{(1 - 0.8)}$ or $x=5M$

Step-by-step explanation:

Consider provided information.

After reading 80% of her emails in her inbox, Danette still has M unread emails

Now we need to determine the expression, that could represents the number of emails Danette had in her inbox before started reading.

Let x be the number of emails before reading.

She reads 80% of x

80% can be written as 0.08.

Therefore, $0.80x$ is the number of mails she read.

Thus, the unread e-mails are

$x - 0.8x = M$

Now we factor out x

$x(1 - 0.8) = M$

$x=\frac{M}{(1 - 0.8)}$

$x=\frac{M}{0.2}$

$x=5M$

Hence, the required expression is $x= \frac{M}{(1 - 0.8)}$ or $x=5M$