since there are 60 sweets shared between 3 girls in the ratio 5:3:2. consider each ratio as x. so it becomes 5 x + 3 x + 2 x = 10 x............... (1) total sweets = 60. 10 x = 60 x = 60/10 = 6............ (2) substitute (2) in (1) it becomes 5 x = 30 3 x = 18 2 x = 12 so the last girl get 12 sweets.