Question 1163161
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Regarding the second student, from the condition we conclude that the remaining 0.3 lb represent  {{{2/5}}}  of his candies.

So,  {{{1/5}}}  of his candies is  {{{0.3/2}}} = 0.15 lb;  hence, the weight of his candies is 5 times 0.15 lb, i.e. 0.75 lb.    <U>ANSWER</U>




Regarding the first student, the relevant info does not present a self-closed Math problem.


It requires additional assumptions from the outside of the given formulation.


So, strictly speaking, that part is not a Math style problem --- it is a Puzzle style, instead.
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