Question 1164059
<br>
x = letters
x = magazines (same number as letters)
x+3 = bills (3 more than letters)
x+3+5 = x+8 = ads (5 more than bills)<br>
The total number of pieces of mail was 35:<br>
{{{(x)+(x)+(x+3)+(x+8) = 35}}}
{{{4x+11 = 35}}}<br>
Finish with simple algebra....<br>