certain grade organizes students to go on a spring outing. If you rent a 35-seat passenger car, you need 4 cars, and if you rent a 42-seat passenger car, you need 3 cars. After arriving at the scenic spot, it is required to group activities, and the number of groups is exactly equal to the number of people in each group. How many people in this grade will participate in the spring outing?
某年级组织同学去春游．如果租35个座位的客车需要4辆，如果租42个座位的客车需要3辆．到达景点后要求分组活动，且分的组数跟每组的人数恰好相等，则此年级共有多少人参加春游活动？
<result>121</result>