Juan collects shells. He had 15 before he went on vacation. On vacation he found 4 shells per day for 3 days. Then he found 6 shells on the fourth day. Write an expression and solve it to find out how many shell he has after vacation.

15 + (4 * 3) + 6 = ?

use pemdas

To find out how many shells Juan has after vacation, we can start with the number of shells he had before vacation (15) and then add the number of shells he found each day on vacation.

First, we need to calculate the number of shells he found on the first three days:
Number of shells found on first three days = 4 shells/day * 3 days = 12 shells

Next, we add the number of shells he found on the fourth day:
Number of shells found on the fourth day = 6 shells

Now, we can calculate the total number of shells he has after vacation by adding the shells found during vacation to the initial number of shells:
Total number of shells after vacation = 15 shells + number of shells found on first three days + number of shells found on the fourth day

Substituting the values we calculated:
Total number of shells after vacation = 15 shells + 12 shells + 6 shells = 33 shells

Therefore, Juan has 33 shells after vacation.