16. (3 points) In a store, there are several pomelos and watermelons, where the number of watermelons is 3 times the number of pomelos. If 30 watermelons and 20 pomelos are sold each day, after 3 days, the number of watermelons is 26 less than 4 times the number of pomelos. How many pomelos were originally in the store? $\qquad$
【Answer】Solution: According to the problem, we know:
3 days later, 90 watermelons and 60 pomelos were sold. The difference in quantity is 30.
Let the number of pomelos later be $x$, and the number of watermelons be $4x-26$. Then the original number of pomelos is $x+60$, and the original number of watermelons is $4x-26+90$; $4x+90-26=3(x+60), x=116$.

Therefore, the answer is: 176