Lesson Problems Involving 1 What's In Try solving the following problem: In a group of 120 students, 68 had ridden a bus, 78 had ridden the LRT, 33 had ridden a jeep, while 40 had ridden both the bus and the LRT, 20 had ridden the bus and the jeep,19 had ridden the LRT and the jeep and 15 had ridden the bus, the LRT and the jeep. a. How many had ridden the bus only? b. How many had ridden the LRT only? c. How many had ridden the jeep only? d. How many did not ride on any of the three modes of transportation?​