Answer:
Joan has 78 Stickers left
Explanation:
Joan gave 74 stickers to Sally: 263 - 74 = 189
Remaining Stickers: 189
Joan gave 51 stickers to her sister: 189 - 51 = 138
Remaining Stickers: 138
Joan gave 60 stickers to Jason: 138 - 60 = 78
Remaining Stickers: 78