Total number of students is 68 in both robotic club and science club. let the number of students in robotics club be X so the total number of students in both science and robotics club will be X+10+X=68 2X+10=68 2X=68-10 2X=48 X=24 students so science club has 24+10=34 students
Since you know that the pet store has 9 dog leashed, and we know that they have 8 fewer dog leashes than dog collars we can just add 8 to 9 to get 17 dog collars
