How many sheets of paper and envelopes are in one package?

Question

frank used 1 sheet of paper and bonnie used 3 sheets of paper for a letter.  frank used up all the envelopes and had 50 sheets of paper left over, bonnie used up all the sheets and had 50 envelopes left over.  How many sheets and envelopes were in the package?

Answer 1

150 sheets

100 envelopes