Find the greatest number which when divided into 1250 and 1000 leaves a remainder of 26 and 28 respectively.
Numbers that leave a remainder of 28 when divided into 1000 are:
486, 243, and 81.
Numbers that leave a remainder of 26 when divided into 1250 are:
612, 306, 204, 153, 102, 51, and 34
I don't see any numbers common to both lists.