Question

5and4=91
15and7=228
21and10=3111
7and3=?

Answer 1

Answer:

5and4=91(5+4=9and 5-4=1)

15 and 7=228(15+7=22 And 15-7=8)

21and10=3111(21+10=31 and 21-10=11)

7and3=104(7+3=10 and 7-3=4)