Group check-in hotel

Solution: If there are X people in a triple room, then there are (50-X) people in a double room.

According to the meaning of the question,150 * 0.5 * x \ 3+140 * 0.5 * (50-x) \ 2 =1510.

X=24，50-X=26。

And 24,3 = 8,26,2 =13.

A: There are 8 13 triple rooms and double rooms.