Erica sells magazine subscriptions and makes a flat rate of $5.35 for each subscription she sells. if erica made $42.80 on monday, $64.20 on tuesday and $74.90 on wednesday, how many subscriptions did she sell in the three days?

1)we add all amounts of money collected:
money collected=$42.8 + $64.2 + $74.9=$181.9

2) Now calulate the numbers of subscritions that she sold in the three days.
ratio=1 subscriptions/$5.35
number of subscriptions=ratio * money collected.

number of subscription=(1 subscription/$5.35) * ($181.9)=34 subscriptions.

Answer : 34 subscriptions:

other method:
we can solve this problem by the rule of three.

1 subscriptions$5.35
x$181.9

x=(1 subscriptions * $181.9) / $5.35=34 subscriptions.

34 subscriptions sold