Considering the total of peas is 72, Sally's initial number of peas was 56.
Assuming the two brothers did not eat any peas, the total of peas both at the beginning and end is 72 peas.
By the end, Sally has 25 peas and Will has 72 peas.
Before the mother declared none of them would have dessert Sally had given Will half of her peas. This means 25 peas represent half of the peas:
25 x 2 = 50 peas 22 peas in Will's plate
Before this, Will had given Sally half of his peas
22 peas x 2 = 44 peas 28 peas on Sally's plate
Right before this, Sally gave Will half of her peas:
28 x2 = 56 peas 16 peas on Will's plate
Let's check this answer:
S= 56 W= 16 -Beginning
S= 28 W=44 - Sally gives Will half of her peas
S= 50 W=22 - Will gives sally half of his peas
S=25 W= 47 -Sally gives will half of her peas
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