Question

Mrs Tay had 425 cookies at first.

Answer 1

425 - 65 = 360 ( what mrs tay has left. )
360 / 3 = 120 ( no. of cookies mrs chan has )
120 - 65 = 55 ( cuz mrs chan received the 65 cookies from mrs tay at first )

thus the answer is 55.

Answer 2

Answer:

425-65=360

360-65=295

Mrs Chan had at first 295 cookies