Number of candies Joan has =351
Number of cookies Joan has =239
Number of candies Master Magus has =48 fewer than Joan =351−48
351−48=303
Number of cookies Master Magus has =76 more than Joan = 239+76
239+76=315
Total number of candies =351+303=654
Total number of cookies =239+315=554
Difference between candies and cookies =654−554=100
654 is a greater number than 554. So, there are 100 more candies than cookies.